Why do we laugh?
We laugh mainly to connect with other people. Laughter signals friendliness and helps build social bonds, and we are about 30 times more likely to laugh with others than alone.
Laughter is older than language. Apes such as chimpanzees and gorillas make laugh-like panting sounds during play and tickling, and scientists think human laughter evolved from these play signals. Even rats make ultrasonic chirps that researchers compare to laughter when they are tickled.
Psychologist Robert Provine found that most laughter in conversations follows ordinary remarks, not jokes. People often laugh to show agreement, ease tension or signal that they are part of the group. Laughter is also highly contagious, which is why TV shows used laugh tracks.
Good for you
Laughing can relax muscles, reduce stress hormones and increase pain tolerance, possibly through the release of endorphins, the body's natural feel-good chemicals. While laughter is not a cure for illness, it can improve mood and help people cope with difficult times.
Did You Know?
Babies usually start laughing at around three to four months old, long before they can speak.
This answer is general information, not medical advice. For a personal health question, talk to a doctor.