Bukhari

Hadith Commentary:
The demand of faith is precisely that every statement of the Messenger of Allah (sallallahu alayhi wa sallam) should be met with "We have believed and affirmed," and it should be accepted without any objection or hesitation. This is because whatever he (sallallahu alayhi wa sallam) has said is entirely from Allah, and it is absolutely true. The fact that there is healing in cupping (hijamah) is a reality that even today's medical science and traditional medicine have acknowledged, because through it, impure blood is removed and healthy blood takes its place, which is, in a way, a guarantee of health.
Allah and His Messenger have spoken the truth.

Hadith Commentary:
(1)
The demand of faith is precisely that the statements of the Messenger of Allah (sallallahu alayhi wa sallam) be accepted without objection or hesitation, because his words are based on divine revelation. The fact that there is healing in cupping (hijamah) is a reality that even modern medicine has now acknowledged. In many hospitals in Western countries, a dedicated department has been established for this purpose.

(2)
By performing cupping (hijamah), impure blood is removed and replaced by healthy blood, which serves as a kind of guarantee for well-being and health. However, it is necessary to seek the services of a skilled and experienced practitioner for this. Getting cupping done by an inexperienced person can be harmful, as will be evident from the benefits of the upcoming hadith.

Hadith Commentary:
Benefits and Issues:
Cupping (hijama) is the best treatment for those people who reside in hot regions, whose blood is thin, and whose blood tends to move toward the outer parts of the body, thereby absorbing external heat. However, for those whose bodies have less heat and who are weak, this treatment is not suitable for them.
(Fath al-Bari, vol. 10, Chapter: The Use of Cupping for Illness)