An invasive fungal infection occurs when fungi enter the body and spread to internal organs, often affecting individuals with weakened immune systems. Common types include Candida and Aspergillus, which can lead to serious health complications if not treated promptly. Symptoms may vary but often include fever, cough, and difficulty breathing. Diagnosis typically involves laboratory tests, such as blood cultures or imaging studies, to identify the specific fungus. Treatment usually requires antifungal medications, which can be administered intravenously or orally, depending on the severity of the infection. Early detection and intervention are crucial for improving outcomes.