Hair diseases and hair loss are interrelated. One cannot be thought about without the other. Common hair loss causes No single factor can be marked out as the universal cause of hair diseases. There are several causes varying from person to person. The two types of hair loss diseases The hair loss causes can be broadly divided into the following two groups – The temporary effect and the one involving a prolonged action, usually triggered by genetics. a.) The temporary effect – Usually such cases can be cured by medications and treatments. b.) Prolonged hair loss diseases – Such cases may require long term treatment. Sometimes the drug treatment might appear to be ineffective. In such circumstances surgery like hair transplantation may be the way.