Cupping therapy is a form of alternative medicine in which a local suction is created on the skin.
As far as I know in the UK the hijama training centres are run by Sunnis. I know a Shi'i person that studied and is certified as a practitioner through one of these clinics. There are hijama clinics in Iran, e.g. Tehran and Qom. The interest in natural medicine and tibb is rising in Iran. If you are based in the West there should be at least one hijama practitioner in a city near you. If you prefer something that is specifically established through the Shi'i tradition, this is a link to an article compiled by several practitioners. Their contact details are on the article: https://reader.elsevier.com/reader/sd/pii/S0254627217301644
There are many institutions of medical sciences according to Islamic traditions. You can find them in Iran, Iraq, Pakistan and India.
You may contact whom you know in any of these cities to get you details.
Yes, Hijamah treatment is very good for all people and it is mentioned in many authentic Hadeeths as one of the most useful ways of treatment. These authentic Hadeeths are mentioned in Shia and Sunni books. The Prophet himself (SAWA) and Infallible Imams (AS) used to do Hijamah for themselves and their families and advised people to do it for treatment and good health.
Yes, Hijamah is very good for health and we have many Hadeeths about its benefits for health and cure. It was practiced and advised by the Prophet ( SAWA) and Ahlul Bayt (AS).