Malaria, caused by Plasmodium parasites and transmitted by female Anopheles mosquitoes, leads to symptoms like fever, chills, and weakness. Dengue, spread by Aedes aegypti mosquitoes, causes high fever, severe headaches, and skin rashes. Chikungunya, also transmitted by Aedes mosquitoes, results in fever and debilitating joint pain. Japanese encephalitis, linked to Culex mosquitoes, can cause brain inflammation and severe neurological complications. These diseases highlight the importance of mosquito control and timely medical intervention.