Muscle Pain / Trigger Points - Causes

Some of the factors in the formation of trigger points include:

Repetitive motion
Sudden trauma to muscles, ligaments, tendons and bursa
Excessive exercise
Chilling of areas of the body such sitting under an air conditioning duct or sleeping in front of an air conditioner
Obesity
Nutritional deficiencies
Lack of activity
Muscle strain

Related Links:
See also treatment and symptoms and what are trigger points?