Thyroid cysts can be small and asymptomatic, but if they grow, they can cause lumps in the neck as well as pain or difficulty swallowing.
These cysts are nearly always benign, but they can have solid parts that can become cancerous.
Thyroid cysts generally do not cause fluctuations in hormone levels, but they can in some cases, particularly if they are large, complex, or turn into a nodule.
Simple kidney cysts can occur with conditions that impair kidney function and often appear on the surface of the kidney.
In many cases, a single cyst can develop on one kidney, but multiple cysts can occur on one or both kidneys.
Simple kidney cysts generally do not have symptoms, but if they grow large enough, they can cause fever or pain in the back, side, or upper abdomen, press against other organs, and require monitoring or interventions.
Simple kidney cysts should not be confused with polycystic kidney disease, a genetic condition in which numerous cysts form and lead to kidney enlargement and dysfunction.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.