Testicular tumors are the most common tumors in men aged 15-35 years. However, regular self-examinations coupled with knowledge of testicular tumor symptoms can help patients to detect and seek timely diagnosis in the early and curable stages of the disease. Symptoms of testicular tumors include a small painless lump in the testicle, a feeling of heaviness in the scrotum, dull pain in the lower abdomen or groin, changes in sensation in the testicle, and sudden bleeding or fluid accumulation in the scrotum. Early detection and diagnosis of testicular tumors is based on the patient’s monthly self-examination. The best time to check is after a hot shower, as the scrotum has relaxed under the heat, making the examination more convenient. The steps recommended by the National Cancer Institute for self-examination are: 1. Stand in front of a mirror and observe if there are any changes in the appearance of the scrotum or if the skin is swollen. 2. Use both hands to examine each testicle. Place your index and middle fingers below the testicles and your thumb above them. Gently touch the testicles between your fingers. When you find that both testicles are not equal, there is no need to panic, that is normal. 3. Above the testicles, you can feel the soft, tube-like structure that is the epididymis. Only by understanding the epididymis, you will not panic by considering it as a suspicious testicular mass. Cancerous testicular masses are usually located on the side of the testicle and occasionally occur above it. If you find a lump, prompt medical attention is the best option. Of course it is possible to find out after a visit that it was a false alarm, but if it is a cancerous lump and is not treated promptly, the tumor will progress very quickly. Remember that early testicular tumors are completely curable, and usually testicular tumors occur unilaterally, and patients can still maintain their sexual and reproductive lives after surgery.