Syphilis
It is caused by the bacterium Treponema pallidum, so it can be treated with antibiotics If left untreated, it can be very serious, even fatal.
It is transmitted through sexual intercourse, but it can also pass from the mother to the fetus.
Symptoms appear one to twelve weeks after contact. Reddish ulcers first appear on the sexual organs, anus, or mouth. When the disease progresses, they appear in other parts of the body and lumps in the neck, armpits, groin, etc. After three years the heart, spinal cord and brain are affected, producing dementia.
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Chlamydia
It is caused by the bacterium Chlamydia trachomatis, so it can be cured with antibiotics. It is transmitted by contact with the mucous membranes of the vagina, mouth, eyes, urethra or rectum. Also a pregnant woman can infect her child during childbirth.
The most characteristic symptoms in men is the urgent need to urinate, burning when urinating, inflammation of the testicles, and in women, thick and yellowish vaginal secretions, burning when urinating, discharge from the urethra, pain during sexual intercourse, etc. It can cause sterility in both sexes. In children it can cause pneumonia, eye infections, and blindness.
Genital herpes
Caused by the Herpes simplex virus or HSV. It causes painful blisters and sores on the genitals, as well as painful urination and lumps in the groin.
It is transmitted by vaginal, anal, and oral sexual contact, and sometimes through skin wounds. People who do not have sores can transmit the virus.
The virus remains in the body forever, and outbreaks often repeat themselves, especially in the first year. There is no cure, but antivirals and other medications can provide relief.
Hepatitis B
It is caused by the hepatitis B virus (HBV) that infects the liver and carries a high risk of death from cirrhosis and liver cancer. There is a vaccine to prevent this disease.
The virus is transmitted through sexual intercourse, breast milk, and through contact with blood or other bodily fluids, such as sharing contaminated hypodermic syringes or razor blades or getting a tattoo with contaminated instruments.
Symptoms appear one month after infection. For example, extreme fatigue, headache, yellowing of the skin and eyes (jaundice), dark urine, nausea and vomiting, abdominal pain, and general malaise
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