Mayo Clinic

Find plain-language explanations of conditions, symptoms, tests and treatments, developed by Mayo Clinic editorial staff with specialist medical review and source references.

SOURCE

www.mayoclinic.org

LAST CHECKED

2026-10-29

ACCESS

Health education is free to read without an account. Clinical services, books and other offerings have separate access and charges.

VISIT ORIGINAL WEBSITE ↗

Best used for

Building background knowledge and preparing questions for a healthcare professional.

What to know before using it

Patient education is not individualized diagnosis or treatment, and medical review is different from journal peer review. Content reflects Mayo Clinic’s clinical perspective; check article dates, references and disclosed interests. The wider site also promotes clinical services. Last reviewed 2026-10-29: official-source desk review. Paid functionality, third-party privacy controls and accessibility certification were not independently tested.

Find plain-language explanations of conditions, symptoms, tests and treatments, developed by Mayo Clinic editorial staff with specialist medical review and source references.

Privacy and access: Reading public health information does not require a patient account. Review the site’s privacy policy before submitting personal information or using linked services.

Review scope: Last reviewed 2026-10-29: official-source desk review. Paid functionality, third-party privacy controls and accessibility certification were not independently tested.

Sources: Official source 1; Official source 2

Our review covers the source as checked on the stated date. Availability, pricing, and third-party policies may change. Verify important claims with original evidence.