Stainless steel pans are typically made of an alloy that includes chromium, which gives the steel its corrosion-resistant properties. However, under normal cooking conditions, stainless steel pans do not release dangerous amounts of chromium gas.
Chromium can be released in the form of fumes if the pan is heated to extremely high temperatures, such as when it is overheated or heated above its melting point. However, under medium heat, it is unlikely that the pan reached such extreme temperatures to produce harmful levels of chromium fumes.
If you accidentally left the pan on medium heat for only 10 minutes with nothing in it, the risk of significant chromium gas release should be minimal. However, to be cautious, ensure that the area is well-ventilated and open windows or use exhaust fans to disperse any potential fumes. If you experience any respiratory discomfort or other symptoms, it is best to seek medical attention.
For specific concerns about your situation, especially if you have any health-related worries, I strongly advise you to consult with a qualified professional, such as a medical doctor or a chemist. They will be better equipped to assess the situation and provide appropriate guidance.