Hi welcome to HCM I can undersiand your concern for severe lower left arm pain . The problem you are facing with your arm could have come on all of a sudden or perhaps taken sometime to really cause you enough torment , You may have hurt your arm or a muscle pull unknowingly which is bothering you . There can be several factors causing pain . a.stretching your forearm muscles beyond their normal range of motion. b.the more likely causes is be overusing the muscles in your upper forearm. It’s urgent and mandatory that you not ignore the signs and symptoms because it could have a impact on how quickly you get better. Don t over use the limb till you fully recovér. To strengthen muscles do some exercises gently may help : 1.Spread your arm in front , fold your hand from wrist up and down 10 times . 2.Make fist tightly , thumb in , open - close - open your fist forcefully - 10 times . 3.Make fist ,spread your arm infront , fold your arm and touch your shoulder with your fist - 10 times 4.Rotate your fist , clockwise and anticlockwise each -10 times . Application of some menthol based gel and crepe bandage helps in relieivng pain and inflammation instantly . To ensure a smooth and gentle recovery, your impaired tissues, muscles and tendons need a steady supply of nutrients . Finally , Best way to keep fit is to boost your immunity by modifying your lifestyle and food habits . Proper regular physical activity , walk ,yoga ,pranyam - deep breathing to boost your blood circulation and detox your system under guidance of trained guide and balanced diet, including ,all essential nutrients as fiber ,vitamins,minrals and antioxidants in natural form all help gain resistance from dseases . Sun light is rich source of vitD good for srengthening bones . Meanwhile ,take Turméric powder , an antioxidant and antibiotic ,a level spoon with a cup of hot milk in b/f and at bedtime , gives relief from pain and inflammation . Lemon juice with warm water ,a pinch of salt and black pepper is an effective antioxidant and energiser . Avoid food that is high in saturated or trans-fats like fried , fast foods , refined sugars and fine floor prducts , tea , coffee , alcohol , sleeplessness , dehyderation , constipation .worry ,stress all induce toxins in your body . It is advisale to consult your doctor before following any regime Hope this helps solves your query .Take care , All the best . Don t hesitate to get back if have any further query