The most likely explanation is that the bursae overlying the sit bones are inflamed. Increased friction from ramping up your cycling may have irritated the bursae causing a painful condition known as ischial bursitis. To help avoid this, increase your seat time slowly to allow the body time to adapt to the new stresses placed upon it. Stretch the muscles that surround the hip (statically stretch the hip flexors and piriformis) to help decrease the friction over the bursae. Apply ice to the painful areas to control the inflammatory process. Finally, make sure you have adequate cycling gear (comfortable seat, good bike shorts) to prevent injury.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.