Women in this phase experience low energy, poor memory, impaired concentration, carelessness, dry skin, cold intolerance, and general aches and pains. After one year postpartum, euthyroid function resumes. Any case with hypothyroid symptoms extending beyond one year postpartum is not considered postpartum thyroiditis.Women who test positive for thyroid antibodies may be at increased risk of developing symptoms associated with postpartum depression than women without thyroid antibodies. Cause
During pregnancy, immunologic suppression occurs which induces tolerance to the presence of the fetus. Without this suppression, the fetus would be rejected causing miscarriage. As a result, following delivery, the immune system rebounds causing levels of thyroids antibodies to rise in susceptible women.Specifically, the immunohistological features of susceptible women are indicated by:
antibodies to thyroglobulin (TgAb)
antibodies to thyroid peroxidase (TPOAb)
increase in TPOAb subclasses IgG1-IgG3
lymphocyte infiltration and follicle formation within thyroid gland (Hashimotos thyroiditis)
T-cell changes (increased CD4:CD8 ratio)
TSH-receptor antibodies (TSH-R Abs)

Diagnosis
This condition is commonly undiagnosed by physicians due to either unfamiliarity with the disease, the subtlety of symptoms, or the attribution of the symptoms to the stresses of having a newborn. Usual screening begins with assessing the thyroid stimulating hormone (TSH) level. A suppressed TSH could represent the hyperthyroid phase, but warrants further testing to investigate for possible Graves disease. A normal TSH with persistent symptoms could represent the shift between phases and requires repeat testing 4–6 weeks later; an elevated TSH at this time could indicate the hypothyroid phase. Treatment
For most women, the hyperthyroid phase presents with very mild symptoms or is asymptomatic; intervention is usually not required.
If symptomatic cases require treatment, a short course of beta-blockers would be effective.Assessing treatment for the hypothyroid is more complex. Women with symptoms or a very high TSH level, or both, are usually prescribed a course of levothyroxine. Asymptomatic women with slightly elevated TSH levels who are planning subsequent pregnancies, should consider a course of treatment until completion of the family to avoid possible developmental complications in future children. Otherwise, treatment could be discontinued after one year postpartum. Prevalence
Women with type I diabetes mellitus have a threefold increase in the prevalence of postpartum thyroiditis than non-diabetic women in the same region.According to Johns Hopkins, 3 in 100 women develop postpartum thyroiditis. Some risk factors include antithyroid antibodies, type 1 diabetes, history of thyroid problems, and family history of thyroid problems. According to the National Institute of Health, postpartum thyroiditis is especially common in Pakistan because it is an iodine-deficient country. References
Further reading
"Postpartum Thyroiditis." Johns Hopkins Medicine, www.hopkinsmedicine.org/health/conditions-and-diseases/postpartum-thyroiditis. Afzal, Rafia. "Thyroid disorders in pregnancy: An overview of literature from Pakistan." Indian journal of endocrinology and metabolism vol. 17,5 (2013): 943–5. doi:10.4103/2230-8210.117202