Cancer is a life-threatening disease that can strike anyone, regardless of age or background. It begins when normal cells in the body start turning into abnormal, uncontrollable cancer cells. Typically, genes guide cells on when to grow and when to stop—but in cancer, these signals are ignored. This unchecked growth leads to the formation of tumors or the spread of cancerous cells.

The causes of cancer vary. While some people inherit it genetically, many develop it due to an unhealthy lifestyle, poor diet, smoking, or environmental exposure. Despite the seriousness of the disease, early detection can be life-saving. Here are 7 early warning signs of cancer you should never ignore:

A noticeable drop in weight—especially when you're not dieting or exercising more—can be one of the first signs of cancer. Appetite often decreases during the early stages, and some treatments can suppress hunger as well. If you're losing weight rapidly without trying, consult a doctor immediately.

A cough that lasts more than three weeks, especially if it's accompanied by blood, could be a warning sign of lung cancer. Don’t ignore a chronic cough—early testing can make a huge difference.

The formation of a lump or unusual swelling in any part of the body—especially if it grows over time—could indicate cancer. This is among the most common symptoms, caused by abnormal cell growth in tissues.

Excessive sweating at night, especially if it soaks your clothes and sheets, can be a symptom of leukemia or lymphoma, two dangerous forms of blood cancer. If this is occurring frequently along with other symptoms, get medical advice.

Pain, discomfort, or visible blood while urinating might signal bladder or kidney cancer. While there can be other causes like infections or kidney stones, it’s best to rule out something more serious.

Problems like persistent indigestion, stomach pain, or difficulty passing stools can be linked to gastrointestinal cancers. Don’t ignore ongoing stomach-related complaints.

Smokers, in particular, should be cautious if they begin experiencing breathlessness. This could be an early sign of lung cancer. Even if you don’t smoke, difficulty breathing shouldn’t be dismissed.