What exactly is an extra nipple? Why does it appear? Dr George Lee has the answers.

Mastalgia derives from the word “Mast-“meaning breast, and “-algia” denoting some kind of pain. Mastalgia can range from mild tenderness and discomfort to severe throbbing and stabbing sharp pain in the chests.

For Pink October, Dr G hopes to spread solidarity and a pink attitude in creating awareness and fighting breast cancer in both women and men.

Dear Dr G, I am in my late 20s and have an active sexual life. My partner and I have sex regularly – sometimes even twice a day.

I email you with alarming concerns about my sexual performance.

I read with interest how honeymoon cystitis can affect the newlywed and raise concerns of trust in a relationship.

I am emailing about an embarrassing problem a newlywed couple, my wife and I, are facing.

Dr G talks about chlamydia.

Dear Dr G, I am 30 years' old and married with two kids.

I am emailing you about a strange problem that my husband has been experiencing since he turned 50.

Dr G talks about the link between testosterone and male pattern baldness.

Dear Dr G, My husband and I are both 54 and have been married for nearly 25 years.