Skin cancer is the most common cancer in the U.S. Learn the main types, warning signs, and the prevention tip dermatologists say not to skip.

Their makers claim they can detect dozens of cancer types — but some scientists say they could be missing many cancers or delivering the wrong diagnosis.

Stomach cancer—or gastric cancer—occurs when cells in the lining of the stomach wall mutate and grow uncontrollably. The stomach wall has five layers, and different types of stomach cancer are often ...

Bladder cancer is mainly urothelial carcinoma, with non-muscle-invasive and muscle-invasive types, and smoking as a key risk factor. Diagnosis involves cystoscopy, biopsy, urine cytology, and imaging ...