Unintentional weight gain can be caused by an underactive thyroid gland or an over active adrenal gland.The adrenal disorder is called Cushing’s syndrome.
Certain types of heart and lung conditions can cause weight gain however this is usually a fluid accumulation obvious in the legs.
Certain medications can cause weight gain. Lexapro can cause weight gain but this would be very unlikely since you have been taking it for 18 months and only experienced weight gain over the past two months.
Pregnancy should be a consideration even though you are taking birth control pills. There are instances where people have been pregnant and still had menstrual flow each month.
Emotional factors particularly depression or excessive eating from anxiety disorders can cause weight gain as well. If you have recently stopped smoking weight gain would be expected also
I suggest that you speak with your physician for a pregnancy test, a screening for Cushing’s syndrome and perhaps a screening for depression.
Routine chemical screening blood work (chem profile) would also be helpful.
You may also find additional information at
www.NLM.NIH.gov
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Good luck
Dr. F
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