There are huge amount of types of laughter. It‘s because there are few ways you can type them, for example: depending on the object you are laughing at (you, other person, just situation); the noise people emit when they lauhg ( from giggles to guffaws and from chuckles to cackles) ; the psichological sutuation when people laugh and other. But I'll write just about few different mostly used in everyday life types of laughter.

Etiquette Laughter (office laughter)

People are tend to rely on laughter as a way to get along with others, thats why sometimes we laugh at things that just aren't funny, whether we're with our boss or with our friends. We also tend to laugh with anyone who can help us out. Reserchers says that it may be just a simpler way to communicate and show agreement.

Nervous Laughter

People laugh when they need to project dignity and control during times of stress and anxiety. In these situations we usualy laugh in a subconscious attempt to reduce stress and calm down. However, it often works otherwise. Nervous laughter is often considered fake laughter and even heightens the awkwardness of the situation.

Pigeon Laughter (bees laughter)

Pigeon Laughter is laughing without opening your mouth. It‘s called that way because by keeping your lips sealed, the laughter produces a humming sound, like the noises a pigeon or bees makes. It is often practiced in laughter therapy or laughter yoga.

Silent Laughter ("Joker's Laughter" )

Silent laughter is a skill we can perfecte. Mindfully practicing silent laughter, though, can have real benefits because it involves the same type of deep breathing that comes with belly laughter.It‘s also practiced in laughter yoga and laughter therapy. A simple smile is often considered a form of silent laughter.

Belly Laughter

It is considered the most honest type of laughter. But it may also be the hardest type to experience, because we have to find something truly hilarious, funny. What‘s more, belly laughter can be he healthful – people are saying that it helpes to fight an illness and has an anesthetic effec. And of course it‘s not just a good physical exercise, it makes us happyer. J

Laughter also may be a symptom of various illnesses.Symptom categories related to Laughter may include:

· Emotional symptoms (1984 causes)

· Euphoria (76 causes)

· Mania (99 causes)

· Psychiatric symptoms (851 causes)

· Mood symptoms (660 causes)

Reed more in http://www.wrongdiagnosis.com/symptoms/laughter/types.htm