My period not come in more than 3 months is that...

How to treat missed period 
It's not normal to have your period missed for 3 months , there should be an underlying cause . first of all you have to exclude or confirm pregnancy as it's the most common cause for most cases . if the test is negative , then you have to start treatment according to the cause . for example in some cases it's due to hypothyroidism so this problem has to be treated by Levothyroxin , in other cases doctors prescribe other medication as Bromocriptine if you have an increase in Prolacine hormone . ot's really important to modify your lifestyle by having healthy food ,stop gaining extra wieght and have a good sleep with daily light exercises , some times you may have to start using OCPs to make your period regular 
What tests have to be done in this case 
Pregnancy test by measuring BHCG in the blood , it's recommened to measure LH, FSH hormones , Prolactin hormon level , TSH level in the blood for hypothyroidism diagnosis , U/S for uterus to figure out any abnormality as PCO 
What is the causes of missed period 
pregnancy 
OCP use 
PCO 
Hypothyroidism 
Hyperprolactinemia 
Obesity 
bad nutritional state 
sedentary life style 
Advice 
You have to visit gynacologist to have the previous test done m and diagnose