### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello, On May of last year i had surgery on my left side of the neck due to a growing cancer tumor. Since then i have been experiencing a greta deal of body transformation, for instance: One day am seatting on the sofa watching tv. and i felt i sudden drop of body muscle from the neck down, literally. I have not been able to regain it no matter what i do. I got concerned and did some research and found out that my level of testosteron was 165 after my doctor sugested a test. Dr. sugested that i do some testosteron treatment with some type of gel call Testim 1% Two months later did a new test to see if there was any improvemet, and the out come was an stagaring 180%. Almost nothing! I d like to ad that i work out 3 to 5 times a week at the gym and while doing so i pump up pretty good, but by the time i get home,a 10 min. bike ridem all the muscle gain is completed gone! i also run 5 miles 2/3 times a week. Am a hispanic male 55 yrs of age. Trully yours, Jorge D/.

### output:

Hi Cancer is associated with release of interleukin in the body which are responsible cathexis. As you didn't mention the cancer type as well as the treatment that you are receiving at present, it is difficult to point out the exact cause of muscle loss. Most of the chemotherapy Chat Doctor.  Moreover, age is another factor, over 40 years target is to maintain the muscle mass rather than gaining it, until and unless you are taking excessive testosterone supplementation. Muscle building is a long and gradual process, gain in muscles size while exercising is called pumping, and it occurs because of pooling of blood in the muscles and not because of actual increase in the muscle fiber count, it is expected to revert to normal within minutes to an hour depending on the intensity of exercise. Take care. Hope I have answered your question. Let me know if I can assist you further. 