In infants, a cow milk allergy may cause symptoms such as vomiting, wheezing, swelling, irritability and bloody diarrhea, according to KidsHealth. Hives or other itchy rashes, such as eczema, may appear on a child's skin... More » Family Parenting Babies & Toddlers

The type of allergy symptoms experienced by adults depends on the specific type of allergy. People can be allergic to foods, drug, latex, pollen, pets, mold and insect stings. Some foods that can cause allergic reactions... More » Health Pain & Symptoms

Chocolate allergy symptoms include abdominal upset, stuffy nose, watery eyes, migraines, hives and lightheadedness, according to HowStuffWorks. Symptoms can also manifest as swelling in the mouth, vomiting, diarrhea, sne... More » Health Conditions & Diseases Allergies

Symptoms of Hirschsprung disease include diarrhea, vomiting, swollen belly and the inability to pass stool, according to KidsHealth. Hirschsprung disease affects the large intestines of children and prevents stool from p... More » Family Parenting Babies & Toddlers

Most pediatricians recommend that parents wait until a baby is 1 year old before introducing cow's milk, according to BabyCenter. A primary reason to delay whole milk is that babies digest breast milk or formula much mor... More » Family Parenting Babies & Toddlers

Most doctors recommend an iron-fortified formula with a cow's milk base. If the baby is allergic to cow's milk, a doctor may recommend soy-based formula. More » Family Parenting Babies & Toddlers

According to WebMD, mild or severe symptoms of lactose intolerance occur 30 minutes to 2 hours after ingesting milk or dairy products, and the most common side effects from a lactose intolerance are bloating, stomach cra... More »