People this is Ruqyah. Its done to remove jinn possession or black magic done on humans.
Its evident from Quran 2:275 -
جو لوگ سود کھاتے ہیں وہ (قبروں سے) اس طرح (حواس باختہ) اٹھیں گے جیسے کسی کو جن نے لپٹ کر دیوانہ بنا دیا ہو
Those who consume interest cannot stand [on the Day of Resurrection] except as one stands who is being beaten by Satan into insanity.
Evidence from Hadith:
Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, was in the company of one of his wives when a man passed by them. The Prophet called to him and when he came, the Prophet said, She is my wife. The man said, O Messenger of Allah, I do not doubt you in the least. The Prophet said, Verily, Satan flows through the human being like blood. - Sahih Muslim 2174
Evidence from medicine - showing where there are diseases that are not diagnosed by any medical means possible, but they are evidently there but hidden.
Somatization Disorder Symptoms
Somatization or psychosomatic disorder is no longer a recognized mental disorder. Check out somatic symptom disorder instead. The information provided below is here for historical purposes. (They have even stopped calling it a mental disorder now as the patient is not in any way mentally unstable)
Somatization Disorder Symptoms is primarily characterized by a history of many physical complaints beginning before age 30 years that occur over a period of several years. The symptoms tend to result in a person seeking out treatment for them through multiple healthcare providers. The disorder also typically results in significant impairment in social, occupational, or other important areas of functioning.
Each of the following criteria must have been met, with individual symptoms occurring at any time during the course of the disturbance:
four pain symptoms: a history of pain related to at least four different sites or functions (e.g., head, abdomen, back, joints, extremities, chest, rectum, during menstruation, during sexual intercourse, or during urination)
two gastrointestinal symptoms: a history of at least two gastrointestinal symptoms other than pain (e.g., nausea, bloating, vomiting other than during pregnancy, diarrhea, or intolerance of several different foods)
one sexual symptom: a history of at least one sexual or reproductive symptom other than pain (e.g., sexual indifference, erectile or ejaculatory dysfunction, irregular menses, excessive menstrual bleeding, vomiting throughout pregnancy)
one psuedoneurological symptom: a history of at least one symptom or deficit suggesting a neurological condition not limited to pain (conversion symptoms such as impaired coordination or balance, paralysis or localized weakness, difficulty swallowing or lump in throat, aphonia, urinary retention, hallucinations, loss of touch or pain sensation, double vision, blindness, deafness, seizures; dissociative symptoms such as amnesia; or loss of consciousness other than fainting)
Either (1) or (2):
after appropriate investigation, each of the symptoms in Criterion_B cannot be fully explained by a known general medical condition or the direct effects of a substance (e.g., a drug of abuse, a medication)
when there is a related general medical condition, the physical complaints or resulting social or occupational impairment are in excess of what would be expected from the history, physical examination, or laboratory findings
The symptoms are not intentionally feigned or produced (as in Factitious Disorder or Malingering).
Lastly,
What is Sihr
Sihr (Arabic: سحر) is the arabic word for magic or witchcraft. Sihr is so called because its means are hidden or secret, and because the practitioners of sihr deal with things in secret which enable them to perform illusions to confuse the people and deceive their eyes, and to cause them harm or steal their money, etc., in a secretive manner so that in most cases nobody realizes what is happening. Hence the last part of the night is called sahar, because at the end of the night people are unaware and they do not move about much. And the lungs are also called sahr, because they are hidden inside the body.