Lung cancer is a major health concern globally, primarily caused by smoking, with other risk factors including exposure to radon gas, asbestos, and air pollution. It often goes undetected in early stages due to subtle symptoms like a persistent cough and chest pain, significantly affecting prognosis and survival rates.

Colorectal cancer, which originates in the colon or rectum, is often attributed to factors such as age, genetic predisposition, diet, and lifestyle choices. Early detection is vital, as symptoms like changes in bowel habits and abdominal pain typically appear in more advanced stages, significantly impacting treatment outcomes and survival rates.

COVID-19, caused by the SARS-CoV-2 virus, presents symptoms ranging from mild, like cough and fever, to severe, including pneumonia and respiratory failure. The virus spreads primarily through respiratory droplets, significantly impacting global health, economies, and daily life through widespread preventive measures such as social distancing and vaccinations.