How should a doctor's letter for a Thai visa appointment be written?

The discussion revolves around how to prepare a doctor's letter confirming a medical treatment appointment for a Thai visa. One user shared their experience of requesting an official appointment letter from Bangkok hospital, which was accepted by the Thai consulate. Another user suggested providing a detailed cover letter from the doctor, including the history and frequency of visits. Additionally, there is a mention of the importance of distinguishing between short-term and long-term treatments, as this affects eligibility for certain visa types.