Hi. Thanks for your query. The swollen area under the left breast ans now bothering you due to pain and and tingling can be due to the following problems: -The commonest being costo-chondritis, -Local swelling due to lump of the breast itself like Fibroadenosis that can be painful and irritating. -Some other swelling like muscular, from fractured rib and so on. I would advise you the following: -First of all get an actual physical examination done by a Doctor, preferably a Surgeon. -Get an X-ray of the chest. Ultrasonography to rule out any internal problems in the abdomen. This will give the correct diagnosis and a plan for further management. Till them stop lifting any heavy object. Get the constipation and / or cough treated as this will increase the problems.