Losing a pregnancy is painful, and losing more than one can leave you confused, tired and full of questions. If you keep asking “why does this keep happening to me?”, understanding the immune causes of recurrent miscarriage can open the door to answers and the right treatment. This guide explains how the immune system supports a healthy pregnancy and what happens when that balance goes wrong. It covers the common causes of repeated pregnancy loss: antiphospholipid syndrome (APS), overactive natural killer (NK) cells, imbalance in other immune cells, and autoimmune conditions such as lupus and thyroid disease. Learn when to start testing (most fertility experts suggest after two miscarriages), how immune causes are diagnosed, and which treatments help, including low-dose aspirin with heparin for APS, thyroid control and progesterone support. It also explains why NK cell testing and treatments like IVIG and intralipid should only be considered after proper evaluation. Written by Dr. Aradhya Achuri, fertility expert in Hyderabad, with answers to common questions and guidance on when to book a consultation. Read the full guide and take the first step towards a healthy pregnancy.