Hypoxemia means there’s not enough oxygen in your blood — especially in the arteries.
Normal oxygen saturation: 95–100% (measured by a pulse oximeter)
Concerning levels:
- 91–94% = Mild hypoxemia
- 86–90% = Moderate
- Below 85% = Severe — requires immediate attention
Even mild drops over time can strain the heart and brain.
8 Warning Signs That May Indicate Low Oxygen
1. Shortness of Breath (Dyspnea)
- Feeling winded during light activity or at rest
- Can occur suddenly or develop slowly
- Common in lung conditions like COPD, asthma, pneumonia, or pulmonary embolism
Not always linked to exertion — if new or worsening, take seriously.
2. Rapid Breathing (Tachypnea)
- Breathing faster than normal to compensate for low oxygen
- Adults: More than 20 breaths per minute at rest
- Often subconscious — you might not notice it until fatigued
A key early sign in children and older adults.
3. Fast Heartbeat (Tachycardia)
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