Is psychosomatics an official science or a pseudo (false) science?

It depends on what to mean by psychosomatics. This discipline exists within medicine and explores the relationship between the mental state of a person and his physical health. There is such a connection, there is accumulated data on how the risk of certain diseases can increase or decrease due to mental state. To quote wikipedia:

The most studied psychological factors of the following diseases and symptoms: bronchial asthma, irritable bowel syndrome, essential arterial hypertension, tension headache, dizziness, autonomic disorders such as panic attacks (often called "vegetative dystonia").

Stress can be a trigger for triggering some kind of systemic diseases - autoimmune or those to which there was a genetic predisposition.

Of course, there is also the opposite effect - if you get sick with a serious chronic illness, mental problems, at least depression, may follow.

But what cannot be trusted (and this has nothing to do with psychosomatics as a science, but is simply a widespread delusion among the people), so these are radical statements like "all diseases are from the nerves", "the soul must be treated" and so such nonsense. Yes, some diseases will be easier to cure if you are mentally healthy. Some will be easier to get sick if your psyche is out of order. But the flu virus is a flu virus and it does not spontaneously arise in your body because you feel sad, and cancer cannot be overcome by mental harmony alone.

https://thequestion.ru/questions/457998/mozhno-li-doveryat-psikhosomatike-kak-nauke

Actually, psychosomatics is not a science in itself, but a direction in the field of medicine, psychiatry, psychology. If we take diseases that are idiopathic in nature (that is, they are not caused by a violation and disorder of body systems), then such pathologies are considered psychosomatic.

This can be irritable bowel syndrome, panic attacks, some types of itchy dermatitis, headaches. tension pains.

It is scientifically proven that 30% of physical disorders are caused by psychogenic factors. Psychosomatics is not a cause of illness, but a catalyst, a trigger.