Persistent cough or hoarseness
A cough that lasts more than three weeks without improvement, especially if it is not related to an infection or cold, may indicate lung cancer. Hoarseness or a change in voice can also be a warning sign of throat or larynx cancer. These symptoms are often mistaken for simple respiratory infections.

Lump or thickening under the skin

A lump or thickening under the skin, especially in areas such as the breast, testicles, or neck, can be an early sign of cancer. While not all lumps are cancerous, any new growth or lump that persists should be evaluated by a doctor, as it could indicate a tumor.

Difficulty swallowing
Difficulty swallowing or a feeling that food is stuck in your throat can be a symptom of throat or esophageal cancer. It may also be associated with lung cancer. If this problem persists, especially with weight loss or vomiting, medical attention is needed.

Sores that don’t heal
Open sores that don’t heal, especially in sun-exposed areas, may be a sign of skin cancer. Mouth sores that persist may indicate oral cancer, especially in smokers or chewers of tobacco. Any sore that doesn’t heal within a reasonable time should be evaluated by a health care professional.

Unusual bleeding or discharge