Waja-ul-Mafasil is a type of arthralgia which involves several joints. It is a chronic degenerative disease of joints and is progressive in character, occurring in middle and later life. Aim of the study was to evaluate the effect of Hijama bi'l Shart (wet cupping) as an alternate treatment option in the management of Waja-ul-Mafasil (Osteoarthritis knee). A randomized open labelled controlled comparative clinical trial was carried out at department of Moalajat, National Institute of Unani Medicine hospital, Bengaluru for the duration of 30 days. 40 diagnosed pa tients of Waja-ulMafasil were randomly allocated to two groups i.e; group-A and group-B, each comprising of 20 patients. In group-A Hijama bi'l Shart was performed over the affected knee(s) on each visit at interval of 10 days for 30 days. The group-B patients received Majoon Suranjan 5gm twice daily for 30 days along with Hijama bi'l Shart. Subjective parameters i.e. Pain, Morning Stiffness, Difficulty in Movement and objective parameters VAS and KOOS were statistically analysed to assess the effect of intervention. There was no significant difference between the two groups concerning baseline characteristics (P>0.05). Both group-A & group-B exhibited statistically significant difference in objective parameters. In intragroup comparison VAS and KOOS showed statistically significant difference in both group-A and group-B (p<0.001). On intergroup comparison group-B showed better response on VAS with p<0.05 in both right & left knee. Hijama bi'l Shart can effectively alleviate the Waja-ul-Mafasil (knee osteoarthritis) without any side effects. The study revealed that Hijama bi'l Shart has potent analgesic & anti-inflammatory effect.