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)
Heart pumps faster to deliver more oxygen-rich blood
Pulse over 100 beats per minute at rest
May feel like palpitations or fluttering in the chest
Especially concerning if combined with dizziness or chest pressure.
4. Fatigue and Weakness
Cells can’t produce energy efficiently without oxygen
You feel drained even after rest
Daily tasks become harder
Brain fog often accompanies this — lack of oxygen affects mental clarity.
