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12. Hypoxia (Lack of Oxygen to the Brain)

Your brain needs a constant supply of oxygen to function. When that flow is interrupted—even briefly—it can cause damage, especially to areas involved in speech and language. This is called hypoxia, and it’s a known cause of aphasia.

You might see this after events like cardiac arrest, near-drowning, or serious breathing issues. Some people wake up able to speak, but struggle to form sentences or understand what others are saying. Others might lose more of their language abilities altogether.

The extent of the damage depends on how long the brain was deprived of oxygen. Some people recover partially over time, while others may face lasting communication difficulties.

A close-up of a finger pulse oximeter displaying oxygen saturation at 91% and pulse rate at 88 bpm, highlighting how reduced oxygen levels (hypoxia) can impact brain function and contribute to conditions like aphasia.

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