The second stage occurs about 6 to 12 weeks after infection. Many people also have swollen glands, headache, fever, upset stomach, a stiff neck, and fatigue. During this stage, the infection can be spread to others. The third stage, which may take place years later, can include many different symptoms such as skin sores and pain in the bones. If the infection spreads to the brain, a person may lose the ability to think clearly.
Some people have heart problems.
During this stage, the infection cannot be spread to others. To make certain the infection is syphilis, the doctor may do a blood test or take a sample of fluid from a sore. Antibiotic medicine is usually given to fight the infection. It is important to follow your doctor's instructions carefully. Syphilis usually can be cured in the early stages, but only if you take antibiotics exactly as prescribed.