Symptoms of hypothyroidism in infants can include:

   Constipation
   Poor feeding
   Poor growth
   Jaundice (yellow discoloration of the skin and eyes)
   Excessive tiredness

  Symptoms of hypothyroidism in children include:

   Similar to adult symptoms
   Excessive fatigue
   Poor growth
   Poor school performance

  Symptoms of hypothyroidism in adults include:

  Early symptoms

   Easy fatigue, exhaustion
   Poor tolerance to cold temperatures
   Constipation
   Carpal tunnel syndrome (pain at the wrists and numbness of the hands)

  Later symptoms

   Poor appetite
   Weight gain
   Dry skin
   Hair loss
   Intellectual ability worsens
   Deeper, hoarse voice
   Puffiness around the eyes
   Depression
   Irregular menstrual periods or lack of menstrual periods