¿Por qué me duele el testículo izquierdo?

When a person has hypersensitivity in the glans, this means that the skin over the glans is too sensitive and causes discomfort and even pain. This can occur due to the reason for various contagions, irritants, or some ailments. Symptoms can include pain, redness, or itching. If you use a gentle way to clean the area, and avoid harsh soaps, and use a soothing cream when necessary.

A dermatologist should be consulted about your dry and itchy skin. The continued use plastic bags during masturbation may result in irritation and even damage to the reproductive system.

You are declining from what is known as post-void dribbling. It's a situation when a few drops of urine come out after you go to the bathroom. This can be the case for both males and females. Most of the time it is not dangerous, and it can come from different things like the bladder not emptying fully or the muscles being weak. Drinking plenty of water is sometimes the solution. If you're not having any other symptoms, it's probably nothing to freak out about.

You might have encountered testicular torsion, a condition of the testicle that twists and cuts off blood supply. This is an acute medical case and you should immediately see a urologist. 

Urinary tract infection is characterized by pain during urination. It is recommended to see a urologist for the right diagnosis and treatment The delay in treatment may also result to a series of complications.

After a kidne­y stone surgery with a DJ stent, it is fine­ to have sex. The ste­nt will not cause problems during sex. But, you should take­ it slow and pay attention to how your body feels. If you fe­el any pain or discomfort, stop and talk to your doctor. Remembe­r to drink lots of water and follow your doctor's advice. 

It can sometimes be challenging to differentiate between a UTI and an STI based solely on symptoms. Both UTIs and STIs can cause similar symptoms such as pain or discomfort during urination, frequent urination, and an urgent need to urinate.