Laughter can also lessen emotional pain. Reducing the emission of the hormone cortisol, which weakens the immune system, probably causes this. This can ease tension and even break the spasm-pain cycle of rheumatism and neuralgia. Increased ventilation and blood oxygen level. This can help people with emphysema and other respiratory illnesses.
Laughter can help in clearing mucus plugs.
Stimulation of the immune system. One researcher found that watching a humorous video caused an increase in interferon-gamma both during and after the laughter experience. Sharpened mental functions. Jokes require attention. Word-plays can keep the mind busy.