Low Oxygen Symptoms: Signs You May Not Be Getting Enough Oxygen

oxygen saturation, normal oxygen level, normal oxygen levels, pulse oximeterOxygen is one of the most abundant elements in the universe. It’s a bit ironic, then, that people with breathing problems can’t seem to get enough of it. The body needs a certain amount of circulating oxygen in the blood at all times to effectively nourish the cells, tissues and organs. When blood oxygen levels drop below normal, a condition known as hypoxemia may occur.

Hypoxemia can be acute, occurring suddenly because of an emergency situation, or chronic, taking place over time because of a long-term health condition like COPD.  Hypoxemia is the main reason that people with COPD are prescribed supplemental oxygen. But many people with COPD are unaware that they’re hypoxemic and, unless prompted to do so for another reason, they don’t immediately seek medical attention. This is unfortunate, because hypoxemia associated with COPD contributes to a reduced quality of life, impaired skeletal muscle function, decreased exercise tolerance and an increased risk of death.1 If you or a loved one have COPD or another chronic illness that puts you at greater risk for hypoxemia, it’s important that you’re able to recognize signs and symptoms of lack of oxygen so that appropriate action can be taken if, or when, it occurs.

Symptoms of Low Oxygen in Blood (Hypoxemia)

Low oxygen symptoms of hypoxemia vary depending upon its severity. If you or a loved one experience any of the symptoms listed below, contact a health care provider as soon as possible:

  • Confusion
  • A sense of euphoria
  • Restlessness
  • Headache
  • Shortness of breath
  • Rapid breathing
  • Dizziness, lightheadedness and/or fainting spells
  • Lack of coordination
  • Rapid heart rate
  • Elevated blood pressure
  • Visual disturbances
  • A bluish tint to the lips, earlobes, and/or nail beds (cyanosis)
  • Elevated red blood cell count or polycythemia (if a long-term problem)

Monitoring Oxygen Levels at Home

The best way to detect hypoxemia is through arterial blood gases (ABGs), however this is generally not possible in the home setting unless you have a doctor’s order for a home care nurse or respiratory therapist. Although it should not be used to replace ABGs in the initial diagnosis of lung disease and the evaluation for long-term oxygen therapy (LTOT), a pulse oximetry monitor plays an important role in the home monitoring of patients with lung disease,2 whether they’re using supplemental oxygen, or not. In fact, along with blood pressure, pulse, respirations and temperature, oxygen saturation is now considered to be the fifth vital sign in many institutions.3

A pulse oximeter is a non-invasive device that measures the oxygen saturation of hemoglobin in the blood. Because it is able to rapidly detect changes in oxygen saturation, it can provide a warning to patients and health care providers alike of impending or existing hypoxemia.3

Normal oxygen saturation levels run between 95% and 100%, but it’s typical for patients with lung disease to run lower. Nonetheless, once oxygen saturation levels drop consistently to 88% and below at rest, a patient should be evaluated for supplemental oxygen therapy.4

What to Do if Oxygen Saturation Levels are Low

If you’re not already using supplemental oxygen and you’re experiencing symptoms of hypoxemia and/or low oxygen saturation levels, don’t wait; contact your health care provider immediately to see about being evaluated for LTOT. Oxygen therapy is appropriate for many conditions that cause hypoxemia, COPD included.

If you are a current user of supplemental oxygen and experiencing symptoms of hypoxemia and/or low oxygen saturation levels, troubleshoot your oxygen equipment to make sure it’s working correctly. If troubleshooting doesn’t resolve the issue, contact your health care provider; you may need an adjustment in your oxygen dose or your current course of treatment.


Author: Deborah Leader RN, BSN, PHN


1Kent, Brian D., et. al. Hypoxemia in patients with COPD: cause effects and disease progression. Int J Chron Obstruct Pulmon Dis. 2011; 6: 199–208. Published online 2011 March 14. doi:  10.2147/COPD.S10611.
2Pierson, DJ. Pulse oximetry versus arterial blood gas specimens in long-term oxygen therapy. Lung. 1990;168 Suppl:782-8.
3International COPD Coalition. Clinical Use of Pulse Oximetry. Pocket Reference. 2010.
4WebMD. COPD and Oxygen Therapy Guidelines: When is it Necessary? Updated 2013.

53 thoughts on “Low Oxygen Symptoms: Signs You May Not Be Getting Enough Oxygen”

  1. britteney says:

    i get dizzy and short of breath

    1. Andy says:

      I have exact same problem. Got any answers?

      1. Inogen Inogen says:

        Hi Andy & Britteney, Since we are not your primary care doctor we can not give you medical advice. There are a variety of reasons why you might feel dizzy or short of breath. We recommend that you reach out to your primary care doctor so that he or she may evaluate you.

      2. Denver says:

        Hello Andy and Brittney, I have been researching the effects of dehydration and it seems that these symptoms can be orientated to dehydration. But I can not legally give you medical advice, I only recommend that you look more into it and tell you doctor.

  2. glinda emery says:

    my muscles in my legs arms fingers start to cramp is this normal

  3. Ann Roy Rogers says:

    i just tested my oxygen tester and I was at 78 and had a headache I did not have my oxygen on but needed to know how do you know when it is getting to low. I have emphysema fibrosis but do not know the symptoms on how to tell if I am low and do not have my meter with me

    1. Nicos Panayiotou says:

      Do airlines carry emergency oxygen if required?

      1. Inogen Inogen says:

        Hi Nicos, Yes if you are taking a commercial airplane your airplane will be equipped with emergency oxygen in case of an emergency.

  4. bob says:

    does smoking make your blood oxygen level drop ?

    1. Web Admin Web Admin says:

      Please read our blog post about Safe Oxygen Levels. Long-term smokers frequently do have low oxygen saturation levels. The blog post will give you insight into oxygen levels overall. – https://www.inogen.com/blog/safe-oxygen-levels/

    2. Raajith says:

      yes, our lungs cant work on for cent percent output, afterall smoking causes many respiratory problems and intercept with the oxygen intake process.

  5. Rachel Dawson says:

    Please could I have an information kit sent to me, as my mother has been told she has low oxygen levels in her blood yesterday, and I need to know all I can to help her

    1. Web Admin Web Admin says:

      Hi Rachel, Thank you for your interest. A Sales Representative will contact you shortly via email.

  6. marlene says:

    I too would appreciate an information kit… I was told I have low oxygen levels at night 21.9% of my sleep time is below 90% .

    1. Web Admin Web Admin says:

      Hi Marlene, Thank you for your interest. A Sales Representative will contact you shortly via email.

  7. Muz says:

    I've been told I have low oxygen levels in my blood when I was sent to the cardio repertory department. I am due surgery for herniated discs in my neck in a few weeks. What does this all mean & should I be worried about it??

    1. Web Admin Web Admin says:

      Hi Muz, Since we are not your primary care doctor, we cannot give you medical advice. We recommend you reach out to your primary care doctor and consult with them.

  8. cynthia lee says:

    whats happening when I take in air but not getting it all out?

    1. Inogen Inogen says:

      Hi Cynthia, I think what you're asking is what happens to the oxygen that is inhaled but not released when you exhale. Oxygen helps move nutrients through your bloodstream. The oxygen level in your blood can be measured using a blood test known as an arterial blood gas (ABG) study. For more information on ABG studies, please visit: https://www.inogen.com/blog/normal-oxygen-levels/

  9. Jacqueline Deans says:

    Could you please send me more information on low blood oxygen. I have been told recently I have a low count and I have some of the systems.

    1. Inogen Inogen says:

      Hi Jacqueline, Please fill out the form on our home page: https://www.inogen.com/ and we'll answer any questions you may have on oxygen therapy.

  10. Kathy Smith says:

    To much or to little oxygen can it cause swelling of the face and and cant stay awake ???

    1. Inogen Inogen says:

      Hi Kathy, If you have COPD, daytime sleepiness could be due to hypercapnia, or high carbon dioxide levels in the blood. Facial swelling could be caused by a number of things, including an allergic reaction, eye infection, tooth infection, sinus infection, and Cushing's syndrome. Have you been told you snore at night? If so, you may have obstructive sleep apnea which is associated with daytime sleepiness too. Much more information is needed to assess the situation and since we are not your primary care doctor we recommend you contact him/her for a diagnosis.

  11. Wendy says:

    My PFT is normal, no sign of emphysema or asthma. But, the letter I received from my pulmonologist stated that I have a pretty significant problem in oxygenating my cells. My SaO2 is generally between 92-97. I have so many symptoms it is hard to determine if they are all due to the fact that I do not have O2 in my bloodstream. I have not had a chance to discuss with my doctor yet. Please advise a possible diagnosis.

    1. Inogen Inogen says:

      Hi Wendy, Since we are not your primary care doctor we can not give you a medical diagnosis. We recommend you contact your primary care doctor for a diagnosis. O2 saturation levels between 95-100% are considered normal and you're running just a little low of that range. This could be due to a number of reasons, including obesity, which is commonly overlooked. You mention that think that you do not have oxygen in your blood stream. Everyone has oxygen in their blood stream. You may just be a little low sometimes. Again we recommend that you contact your primary care doctor who can order additional lab work to be done and can refer you to a specialist near you.

  12. Jonna Ilarde says:

    my office is enclosed. i am suffering from clogged ear from time to time, especially when stressed. is there something to do with lack of oxygen?

    1. Inogen Inogen says:

      Ho Joanna, We recommend that you go to your primary care doctor and discuss your symptoms with him or her. They will be able to diagnosis your symptoms and discuss treatment options.



    I have a question. I am on oxygen all the time. I started getting symptoms that feels like I have a fever but when checked I do not. Some days it is all day long. Some days it is 2 or 3 times. I take tylenol and it goes away. I am on the Tilogy machine that hooks up to my oxygen. I have been to my Pulmonary doctor and she said it was the humidifier hooker to my machine. I unpluged it and still have the symptoms. I have also been to my MD. They can't find the reason. Could it be that I am not getting enough oxygen through the night or the setting are wrong on the machine? I have already did the overnight test . Do you have any ideas if so please help.

    1. Inogen Inogen says:

      Hi Lorene, In cases like this, it is often good to consult a secondary pulmonologist. A secondary doctor may be able to diagnosis your symptoms.

  14. Karol says:

    I have congestive heart failure. I feel I don't have enough air. Dr. gave me a test, walk 6 minutes on a flat service in an air conditioned office, pulse ometer read 88. My problem is when I am out doing shopping, air quality is bad, trying to bend pickup things from the floor, easy basic house work, getting from my car to a store, car to my ramp with an incline to my front door.
    I need to stop and rest maybe 4-6 times to continue. I become very out of breath, pressure around heart, my legs feel tight, my son has to get the wheel chair to bring me into the house. My doctor says I don't need oxygen, this she determined by a 6 min walk in air conditioned building. My CHF doc says she does not think lack of air is do to my CHF (left side) now they tell me there are changes to my right side of heart. I am completely weak an incapable of any basic tasks, like bathing in a tub, the list goes on and on. They won't even let me try oxygen for a couple of days to see if it helps. What can I do??

    1. Inogen Inogen says:

      Hi Karol, In cases like this, it is often good to get a second opinion. A secondary doctor may be able to diagnosis your symptoms.

  15. Mona says:

    We have moderate air quality alerts due to fires. It has een over a week. I am using my inhaler and flonase. Been having dizziness and sweating. Should I contact my Dr?

    1. Inogen Inogen says:

      Hi Mona, Yes it is always a good idea to contact your doctor when you are experiencing abnormal symptoms. A doctor will be able to determine whether or not your symptoms are related to the fires or to a medical condition.

  16. subroto kumar das says:


    This is Subroto kumar Das
    I have irregular Yawns & sometimes before yawning I feel uncomfortable .

    please let me know any suggestion you have

    1. Inogen Inogen says:

      Hi Subroto, It is always a good idea to contact your primary care doctor when you are experiencing abnormal symptoms. A doctor will be able to diagnosis your symptoms and prescribe appropriate treatment.

  17. Beverly Sharon says:

    I have been told I have low oxygen levels during sleep. During the day my oxygen levels are good. However, at times my toes and fingers turn bluish even in the daytime. Is this from lack of oxygen at night?

    1. Inogen Inogen says:

      Hi Beverly, It is always a good idea to contact your primary care doctor when you are experiencing abnormal symptoms. A doctor will be able to diagnosis your symptoms and prescribe appropriate treatment.

  18. Carolyn Hargrove says:

    have Copd and enphazima, last 2 weeks with blood pressure spikes will go from 168/73 then drop within 2 to 3 hours to 128/68 some mornings ,balance is off, dull headache, head fells like I'm in a fog, at times heart rate is high but blood pressure is normal, had a blood panel done was good 2 wks ago blood pressure spiked to 193/100 went to er magnesium was at 1 thought that was the answer, it wasn't been a week today still the same, any suggestions on what to ask my Dr, and yes I'm a smoker

    1. Inogen Inogen says:

      Hi Carolyn, We encourage you to tell your doctor about the symptoms you just described here. Do you experience blood pressure spikes or headaches while exercising or are you experiencing these symptoms while you sit? Make sure to let your doctor know the circumstances surrounding your symptoms and ask if there is any situations (driving, exercising, etc.) that you should avoid.

  19. Cheese Lungs says:

    Yo anyone know anything else about this, like if congestion could cause this? The first time I got bronchitis, I thought I was okay; I woke up and went to a doctor's appointment (that I had scheduledlong before this), feeling sick but okay enough to function. When I got there, one of the nurses said my oxygen is too low for them to let me go and they basically held me hostage for 2 rounds of breathing treatments, which was basically like inhaling really bad perfume. I no longer have health insurance and recently caught bronchitis. It developed over the past 2 days and I'm already coughing up macaroni. I don't know how to really tell if my oxygen is going down like last time and trying to figure out what to do >_>

    1. Inogen Inogen says:

      Hi – We're sorry to hear about your bronchitis diagnosis. Although you do not have insurance, it is important to see a doctor so that you can be prescribed appropriate treatment. Regarding your oxygen levels, you can test yourself at home using a Pulse Oximeter. For more information on Pulse Oximeters, please visit: https://www.inogen.com/product/pulse-oximeter/

  20. Philip says:

    I visited the hospital the other day and they put the SP02 sensor on my finger. It was reading between 94 and 95%. I seem to be borderline and i don't take oxygen, what can i do to make my readings better. I have bought a cheap finger sensor off eBay and it shows 95 whereas everyone else in the family i test is 98-99.

    1. Inogen Inogen says:

      Hi Philip, Normal oxygen levels are typically between 95-100% so you are correct when you say you are right on the borderline. Pulse oximeters are slightly less accurate than a arterial blood gas (ABG) study. An ABG study would need to be conducted by your doctor in order to fully determine your oxygen saturation level. We recommend you consult your primary care doctor and have he or she do a full exam so that they can diagnosis your symptoms. In the meantime, try some of our breathing exercises for COPD: https://www.inogen.com/blog/copd-breathing-exercises/

  21. kimberly hixson says:

    I have trouble catching a full breath of air. I have episodes where my heart will begin to beat heavily and also the pulse will begin beating intenseky beating rapidly. I get light headly daily, i"m constanly feeling fatiged. I"m also noticing a lack of memory about current things i"ve done, such as i can't recall something i just finished doing five minutes ago. also my long term memory is being affected. I'm always cold. I don't suffer from frequent headaches but, at the few times i do the pain is horrible. I've felt such an intense pain in my chest, that will bring me to tears. i"m only 32 years old. could you offer any suggestions?

    1. Inogen Inogen says:

      Hi Kimberly, We're sorry to hear about your symptoms. However, since we are not your primary care doctor and we do not have access to your medical records, we are not legally allowed to give you any medical advice. Have you contacted your primary care doctor yet to discuss your symptoms? He or she has access to your medical history and will be able to run tests to determine what the cause may be.

    2. Ylena says:

      Hi Kimberly, you may have resolved this by now but ask your doctor about Postural Orthostatic Tachycardia Syndrome(POTS)

  22. Nur says:

    I have most the symptoms described. I thought that it was normal to feel fatigue and short of breath until I met the ENT specialist and have a CAT scan. It seems that I my airway is obstructed plus sinus problem. I had a minor surgery to correct the airway. Now, I no longer cough in my sleep and I breathe better. Please meet your ENT to check further if you have symptoms.

  23. Douglas Hogan says:

    Low Oxygen levels can also be indicative of Pulmonary Hypertension. Since this diagnosis is often overlooked by pulmonary specialists, it might be wise to at least ask your Pulmonologist about it.

  24. Ruth Pappamihiel says:

    was wondering if my symptoms when I get up in the am could be from lack of oxygen during the night , this am I seemed very dis-oriented and unstable movements, I do have slight COPD, and 2 stents in my heart. I do have app. with drs, next month. Thanks for any help.

    1. Inogen Inogen says:

      Hi Ruth, As we mention in the blog post above, lack of coordinated movements, dizziness, and disorientation are symptoms of low oxygen. We hope this information is helpful and that your doctors appointment goes well next month.

      1. Ruth Pappamihiel says:

        Thanks, was hoping for more, maybe lady your mind is making you crazy!

  25. cindy says:

    my oxygen level was 88 at the er -was wondering if beer etc has any thing to do with this

  26. Tari says:

    I have been exposed to carbon monoxide due to a leak in my car's exhaust system. Lots of dizziness and felling out of it. Went to my primary dr and they had me get a blood test. My O2 saturated Ven is at 47.6% which is quite a bit lower than the low end. They do not feel the need to pursue any further. The Carboxyhemoglobin was 0.1

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