[Carrie5210]

Yes, having an underactive thyroid causes weight gain....but thyroid issues are not always so cut and dry......an underactive thyroid can be attributed to your thyroid or to your thyroid and your pituitary gland and/or endricrine problems as well. And not everyone that has Hyperthyroidism loses weight or is skinny.....

Also being on thyroid medication does not always stop you from gaining weight, it's a long misbelief that people who take thyroid medication lose weight, most people do not lose weight on it. When you have issues that cause problems with your thyroid, it causes long term problems with your BMR (basal metabolic rate) that can last long past starting thyroid medication. And once you start the medication it can take a long time to adjust the levels to find a happy place where your body actually reacts correctly to it....then if you are not responding to the normal T4 synthetic that is usually prescribed (synthroid) there is the option of convincing your doctor to try the natural thyroid T4 (Armour, Westhroid) or a combination of natural T4 and a synthetic T3 (cytomel) as there are some who do not convert T4 to T3. Then there is the constant blood tests to see where your TSH and Free T3 and T4 levels are to eventually get them to within a normal blood reading (adjusting those levels).......and then there some people who may have normal readings but their symptoms are still presenting.....

As far as taking along with Phen, well there are doctors that say you can take it and it's fine, others that won't. Most of what I have come across said do not take if you are HYPERthyroid (over active thyroid). It's going to be the doctor's choice as to whether they feel comfortable doing so in the condition of someone that is Hypothyroid....do your research.

Being as educated and well informed about your condition as you can be will benefit you in the end. Knowledge is power and power is control when it comes to your own medical care....regardless if you are talking about thyroid issues and weight gain/loss or breast cancer.