I have had gynecomastia for like 6 years now on my left chest, it hurts when pressure is applied, and streched vertically, is this a bad sign?

Yes: This sounds like the gynecomastia which is breast tissue is spreading. The fact that it is tender is common and does not mean there is something more serious like cancer. You should see an endocrinologist because there is medicine that can help the pain and sometimes shrink the tissue. However, the longer it is present, the less likely it is to go away and may have to be surgically removed.

See Plastic Surgeon: You should see a board certified plastic surgeon. Let him/her examine you and advise you.

Seek Consultation.: Best to seek consultation with board certified plastic surgeons. If persistent, symptomatic and/or aesthetically displeasing, surgical correction of gynecomastia can be worthwhile. Treatment is individualized depending on the specific patient's situation; involves direct excision of glandular tissue, liposuction surgery, and/or occasionally excision of excess skin as well.

Gynecomastia: It seems that you have unilateral non-resolving gynecomastia. An endocrinologist will need to examine you and perform some investigative work-up. If medical causes are eliminated then s/he will refer you to a plastic surgeon for surgical correction.

See your PCP: ; have him check your testicles for possible tumor

Not uncommon: It is not uncommon for benign gynecomastia to be tender to the touch. Rarely breast masses are tumors, or are caused by testicular tumors. Most commonly they represent benign breast tissue. New. Or enlarging tissue should be checked by your primary medical doctor to be safe. More info here: http://www.Sanfranciscobreast.Com/gynecomastia.Html.

Look into it: You should be evaluated for starters by an endocrinologist and possibly a breast specialist. If this current condition (pain) is of no serious nature, then plastic surgery will be beneficial. Good luck from NYC