AIDS is caused by the HIV virus which is transmitted through bodily fluids and blood-to-blood contact. Early symptoms include swollen lymph nodes and fatigue, while later symptoms include weight loss, diarrhea, and attacks of shingles. There is no cure, but antiviral drugs can treat HIV/AIDS. Prevention involves avoiding practices like sharing needles or having unprotected sex. Over 22 million people in Africa have been diagnosed with AIDS since 1981. Parkinson's disease causes slow movement, muscle rigidity and tremors due to a lack of dopamine. It is not contagious and may be inherited or caused by environmental toxins. Symptoms include tremors, stiffness, and impaired motor skills. Treatments aim to boost