Other signs and symptom may include haematuria; loin pain; abdominal mass; malaise, which is a general feeling of feeling unwell; weight loss and / or loss of appetite; anaemia resulting from depression of erythropoietin; erythrocytosis ( increased production of red blood cells ) due to increased erythropoietin secretion; varicocele, which is seen in males as an enlargement of the pampiniform plexus of veins draining the testis ( more often the left testis ) hypertension ( high blood pressure ) resulting from secretion of renin by the tumour; hypercalcemia, which is elevation of calcium levels in the blood; sleep disturbance or night sweats; recurrent fevers; and chronic fatigue.
