A long hard object can be felt in the right lower abdomen lying down, which may be caused by fibroma, lymphoma, pelvic tumor and other diseases. 1. fibroma: under the stimulation of triggering factors, the tumorigenic factor of fibroma becomes active, thus forming fibroma, which is felt as a long hard object. 2. Lymphoma: It may be caused by virus, physical or chemical stimulus invading the human body, inducing malignant changes of cells, causing lymphoma, resulting in painless progressive lymph node enlargement as the characteristics of the disease, which involves the right groin area will lead to the right lower abdomen lying down and can feel a long hard object. 3. Pelvic tumors: right pelvic tumors, such as ovarian tumors, teratomas, etc., when palpated, may be in the right lower abdomen can be felt lying down a long hard object. A long hard object palpable in the right lower abdomen may also be seen in varicocele in men and inflammation of fallopian tube in women. If you notice symptoms of a hard lump in your lower right abdomen, you should seek medical attention and treatment.