News says 'stroke & relieve swelling on the brain'.

Stroke is due to lack of oxygen to the brain. Swelling on the brain? This is what stroke/swelling on brain is;

'Brain swelling, referred to as cerebral edema, is one of the immediate short-term dangers of stroke. Large strokes, in particular, may cause significant swelling that can rapidly worsen, leading to serious consequences including severe brain damage, a permanent state of unresponsiveness, or even death.'