Hepatitis B is a sexually transmitted liver disease. It’s hard to recognize because the symptoms vary quite a bit from person to person.
Common complains are extreme fatigue, joint pain, loss op appetite, nausea and vomiting, a yellowing of the eyes and the skin, fever, dark colouring the urine and a lightening of the stool.
Only half of the people infected get symptoms, but they can still spread it. Without knowing it they can infect others. It’s very contagious.
If people are infected the virus is found in the blood, semen, vaginal secretions and - in low concentrations - in saliva. Both (anal) intercourse and oral sex can lead to infection. Tongue kissing also poses some risk. One should also be careful with sharing needles (drugs, body piercings and tattooing).
It can heal by itself, but also cause liver failure, liver cancer and even lead to death.
Acute Hepatitis B needs no treatment. There are medicines to treat chronic Hepatitis B. If you are at risk you can get a hepatitis B vaccine.