What are the major reasons for hair loss?

There is not one specific reason for hair loss. Many factors play their part in hair loss. Family history has a direct link with male-pattern baldness and female-pattern blandness. Alteration of hormonal levels during and after pregnancy is also a big reason for excess hair fall. Similarly, some medications and drugs also trigger hair loss while exposure to radiation and heat is also harmful to hair growth. In many cases, stress and certain hairstyles have also caused hair problems.