I am 47 years old was diagnesed 8 months ago with early stage lobular cancer (2 tumors in left breast, 1.6 cm and 2.6 cm) and opted for a bilateral mastectomy. My tumors were ER+, PR
+ and Her2+. Lymph nodes were negative. Adjuvant therapy consisted of 4 rounds of chemotherapy (Taxotere, Carboplatin, and Herceptin) every 21 days and now Herceptin only to complete one year. I just had my 10th Herceptin infusion and my eyelashes, eyebrows, and even my underarm hair are falling out again. The hair on my head (all 1.5 inches of it) seems to be intact although growing very slowly. What is causing this hair loss and will the hair on my head fall out again? I'm terrified of losing the hair on my head again. My onc is testing my thyroid with a blood test but says it's probably a hormonal thing due to sudden onset of menopause with the 2nd round of chemotherapy. I don't think it's diet or stress related, so if it's not my thyroid, could the Herceptin be contributing to this or is estrogen most likely the culprit?