There are three main types of symptom:

• Remitting symptoms: When symptoms improve or resolve completely, they are known as remitting symptoms. For examples, symptoms of the common cold may occur for several days and then resolve without treatment.
• Chronic symptoms: These are long-lasting or recurrent symptoms. Chronic symptoms are often seen in ongoing conditions, such as diabetes, asthma, and cancer.
• Relapsing symptoms: These are symptoms that have occurred in the past, resolved, and then returned. For instance, symptoms of depression may not occur for years at a time but can then return.

Some conditions show no symptoms at all. For example, a person can have high blood pressure for years without knowing, and some cancers have no symptoms until the later, more aggressive stages. These are known as asymptomatic conditions, and even though the idea of symptoms is often linked to discomfort or abnormal function, a condition without symptoms can be deadly.

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Many types of infection do not show symptoms. These are known as subclinical infections, and they can be contagious despite not causing noticeable symptoms in the person carrying the infection. The infection can still be transmitted to other people during the incubation period, or the period during which the infectious agent takes hold of the body.

Another danger of subclinical infections is that they can cause complications unrelated to the infection itself. For example, untreated urinary tract infections (UTIs) may cause premature births.

Examples of infections that do not cause symptoms initially are HIV, human papillomavirus (HPV) herpes simplex virus (HSV), syphilis, and hepatitis B and C.

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The first time a person will be aware of many asymptomatic conditions is during a visit to a doctor, normally concerning a different problem. It is important to undergo regular health checks to identify any underlying problems that may not be obvious.

Many cancers are asymptomatic during their early stages. Prostate cancer, for example, does not show symptoms until it has advanced to a certain point. This is what makes some cancers so dangerous, as early treatment is often crucial when treating cancer.

For this reason, regular screening tests are important for at-risk individuals.

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