A disease or condition that usually lasts for 3 months or longer and may get worse over time. Chronic diseases tend to occur in older adults and can usually be controlled but not cured. The most common types of chronic disease are cancer, heart disease, stroke, hypertension, diabetes, asthma and arthritis.

Untreated, an STI can become a disease. HIV is one such sexually transmitted infection, but it can progress to a disease called acquired immunodeficiency syndrome (AIDS) when HIV infection is untreated. Other examples of STDs are chlamydia, gonorrhea, human papillomavirus (HPV) infection, and syphilis.

Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs. Young children, older adults, pregnant women and people with chronic disease or weak immune systems are at high risk. An annual vaccine can help prevent the flu and limit its complications.

Contraception commonly known as Birth control, also known as anticonception, and fertility control, is a method or device used to prevent pregnancy. This allows putting off having children until their bodies are fully able to support a pregnancy. It can also prevent pregnancy for older people who face pregnancy-related risks. Use also reduces the need for abortion by preventing unwanted pregnancies.

Sonar, sometimes refered to as an ultrasound scan, is a medical test that uses high-frequency sound waves to capture live images from the inside of your body. It’s also known as sonography. These scans can provide an expectant mother with the first view of her unborn child. However, this is only one of the test's many other uses.

Circumcision is a procedure that removes the foreskin from the human penis. Common reasons for it include a reduced risk of some sexually transmitted diseases in men, protection against penile cancer and a lower risk of cervical cancer in female sex partners.