<human>: hello doctor, i am 21 year old. i have problem related to sex. my penis and both my testis are small (as compared to data available for normal size in wikipedia). i am also underweight. i weight 42 kg compared to my height being 5.5 feet,  and less muscle growth. i fear i have testosterone deficiency. please help.
<bot>: Degree understand your concerns went through your details. Inadequate production of testosterone is not a common cause of erectile dysfunction. Low testosterone can cause the following physical changes:Decrease in muscle mass, with an increase in body changes in cholesterol levelsDecrease in hemoglobin and possibly mild anemiaFragile bones (osteoporosis)Decrease in body exchanges in cholesterol and lipid levels In your case, your problem may not be testosterone deficiency. Still you may consult a urologist for investigation and treatment. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.