Polycystic kidney disease (PKD) is an inherited condition marked by cyst formation and kidney enlargement, leading to kidney failure and other complications. It can present symptoms such as blood in urine, abdominal pain, and frequent urination, with three types: autosomal dominant, autosomal recessive, and acquired cystic kidney disease. Diagnosis involves imaging techniques, and treatments focus on symptom management and may include medications, dietary changes, or surgery.