You mean there are two types of diseases, superficial disease and inner disease. Superficial disease can be cured but inward disease can not be cured by medicines.In past time when physicians (ved ji, hakim ji) were not having sufficient knowledge, they used to say some thing like that, patient can not be cured because this disease is a result of his past life karma.
In Tibetan Medicine, these are called karmic diseases. According to you it is not curable, even then there are medicines and therapies do restore the system and relieve pain and control disease state. It depends on the physician’s experience. Experienced physicians can discover many of the psychic and physical complaints. Some hidden diseases may be difficult to reveal. But pulse reading alone may not be sufficient to measure all disorders, therefore physicians also use other examination techniques to discover more hidden disorders, e.g. urine analysis, tongue diagnostic, ear and facial diagnosis and especially questioning. They are very important elements of the Tibetan medical diagnosis field.
The believe that patient is getting punishment of his past sin, make the situation miserable for the patient and he would have to face abhorrence instead of sympathy from the society. Techniques and instruments could not develop as needed with the development of time and disease.