Study aim: Investigating the effect of‏ ‏conventional physical therapy with and without ‎breathing pattern correction exercises on pain, range of motion, size, ‎volume of the swollen limb, respiratory parameters and quality of life ‎in patients with breast cancer related lymphedema (BCRL)‎ Design: A clinical trial with a control group, with parallel groups, double-blind, randomized on 40 patients. Software will be used for block randomization. Settings and conduct: Women with first-degree lymphedema after breast cancer treatment, who refer to the oncologist of Golestan Hospital in Ahvaz, will be included in the study if they are eligible and will be randomly assigned to the intervention and control groups using the random block method. This study will be performed in a double-blind manner and the blinding includes a physiotherapist who performs the pre- and post-treatment evaluation in addition to the person who analyzes the data. Participants/Inclusion and exclusion criteria: Inclusion criteria: Age 80-32 years, First-degree unilateral lymphedema, Patients with breast cancer who had axillary lymph node surgery, The difference in the measured points between two organs should be between 2 and 8 cm at least in one point of the organ. Exclusion criteria: History of chronic respiratory disease, Receive other treatments at the same time Intervention groups: Control group: usual treatment of lymphedema and intervention group: usual treatment along with respiratory pattern correction. The duration of the treatment will be 4 weeks (3 sessions per week, once a day). The duration of each session is 40 minutes. Common treatments include lymphatic massage, exercise, skin care, and compression sleeves. In the intervention group, breathing exercises are added. Main outcome variables: pain, upper limb circumference size, Respiratory indicators