•  Alcohol or smoking
  
•  Sudden stopping of intake of coffee / tea.
  
•  Changes in hormone levels during a woman’s menstrual cycle or with the use  of birth control pills
•  Changes in sleep patterns – excess sleep or less sleep
  
•  Exercise or other physical stress
  
•  Excessive stimulation or stress on sense organs by loud noises  bright lights,  strong perfumes / odours,
•   Fasting, Indigestion
  
•  Stress and anxiety
  
•  Suppression of natural urges
  
•  In take of polluted food, Oily and spicy food, In take of  dry, pungent and  salty food etc
• Exposure to sun shine for prolonged period
  
• Anger, jealousy, grief, stress etc.