Firstly stop going gym for some time..give rest to ur left arm....get done with mri....then all ur shoulder movements need to b assessed...if some restriction is there or so ...so get connected to a physiotherapist...

Hello. Provide some photos and videos in which pain comes , or provide more details like in which specific movement pain comes or trigger. Get an MRI of your shoulder , it will reveal any injury of your shoulder. And till then kindly avoid forcefull movements that too with weight...it is doing nothing just making it more worse in any form. Further you can consult for more details. Thanks

As you mentioned that guide at gym mentioned about injury at your shoulder , you need to get it treated. If there is pain in your shoulder at rest or particular activities to name a few like if you comb the hair with left hand or may be when you raise your your arm to bolt a door....or specific activities.....a physical examination by physiotherapist is required. Once pain is managed and injury is healed  .strengthening exercises have to be done.

Initially go to a physiotherapist and know about conditions

You need proper physical assessment to rule out any internal injuires, consult in person with orthopaedician or physiotherapist for assessment to get proper treatment.

First of all, you have to rule out the cause for your shoulder weakness and pain. So you should take a MRI shoulder to find out the cause then you can consult a Physiotherapist in person for further assessment and treatment.

Hi, no person in the world can double up as a professional in 2 different fields. Gym trainer can't become physio but a physio can advise as to how to train in gym. In ur case, if there is a shoulder injury happened unknowingly, plz get it checked at nearby Physiotherapy or orthopedic clinic. Physio can advise how to become fit from unfit n also how to maintain fitness. Gym trainer cant treat as he knows how to keep fit n maintain the same.

Visit nearby physiotherapy clinic for proper assessment and treatment

Visit a local Sports Physiotherapist to diagnose and treat your condition

Hi, Im a sports physiotherapist dealing with many athletes who work out in gyms and present with similar shoulder pains and I have experienced the same. Sometimes either due to prior injury or improper workout form (eg. Bench press with shoulders rounded) you have a risk of developing a rotator cuff injury (supraspinatus tendon tear or impingement) you can confirm this either by a Ultrasonography from a centre that can diagnose musculoskeletal injuries or by a good sports physiotherapist or orthopedic. Post that a good balance of tight muscle release and a gradual rehabilitation (theraband and light weights) for your rotator cuff muscles for 6-8 weeks will have to be followed. During this time you will have to avoid certain movements like overhead exercises and weights to allow the healing process to go uninterrupted. This will be done undersupervision by an able sports physiotherapist. It could be followed by gradual lifting with correct exercise form. MRI too gives the complete picture of your shoudler but should be the last resort if exercises dont help.

Hi, Dominated hand will have good muscle strength compared to another hand. kindly notice if the pain persists only during a gym session or throughout the day. depends on the protocol will vary.

Sometimes your neck and shoulder muscles will involve in this time some group of muscle will get tight some group of muscles will get weak for that we need to assess properly and need to release tighten muscles need to strength Weeknd muscles For release need to do manual therapy and some modality

Visit Nearest Physiotherapy clinic for complete assessment and treatment

Dear patient. You need an online consultation for best diagnosis and treatment.

Hi please visit an orthopaedic doctor for diagnosis the condition. N then u can carry your gym. But first get urself assessed.