The hallmark of infantile pyloric stenosis is progressively worsening vomiting within the first few weeks to months of life. A positive history of bottle feeding and cesarean section delivery is suggestive of infantile pyloric stenosis. The most common symptoms of infantile pyloric stenosis include vomiting, belching, persistent hunger. Less common symptoms of infantile pyloric stenosis include failure to gain weight or weight loss, jaundice, lethargy and decreased urine output. The hallmark of adult type pyloric stenosis is progressively worsening projectile vomiting. A positive history of chronic peptic ulcers and fibrosis near the gastric outlet is suggestive of adult type pyloric stenosis. The most common symptoms of adult type pyloric stenosis include vomiting with occasional relief after vomiting, belching, epigastric pain. Less common symptoms of adult type pyloric stenosis include failure to gain weight or weight loss and symptoms of dehydration like increased thirst, dry mouth and decreased urine output.

• The hallmark of infantile pyloric stenosis is progressively worsening vomiting within the first few weeks to months of life.^[1]
• The vomiting in infantile pyloric stenosis is often non-bile stained and projectile.^[1]
• A positive history of bottle feeding and cesarean section delivery is suggestive of infantile pyloric stenosis.^[2]
• The most common symptoms of infantile pyloric stenosis include vomiting, belching, persistent hunger.
• Less common symptoms of infantile pyloric stenosis include failure to gain weight or weight loss, jaundice, lethargy and decreased urine output.

Patients with infantile pyloric stenosis may have a positive history of:^[2][3]

• Bottle feeding
• Cesarean section delivery
• Exposure to drugs during pregnancy
  • Macrolides
  • Nitrofurantoin
  • Penicillins
  • Trimethoprim-sulfamethoxazole

Common symptoms of infantile pyloric stenosis include:^[4]

• Vomiting
• Belching
• Persistent hunger

Less common symptoms of infantile pyloric stenosis include:^[4]

• Failure to gain weight or weight loss
• Jaundice
• Lethargy
• Decreased urine output

• The hallmark of adult type pyloric stenosis is progressively worsening projectile vomiting.^[5]
• A positive history of chronic peptic ulcers and fibrosis near the gastric outlet is suggestive of adult type pyloric stenosis.
• The most common symptoms of adult type pyloric stenosis include vomiting with occasional relief after vomiting, belching, epigastric pain.
• Less common symptoms of adult type pyloric stenosis include weight loss and symptoms of dehydration like increased thirst, dry mouth and decreased urine output.

Patients with adult type pyloric stenosis may have a positive history of:

• Chronic peptic ulcers
• Fibrosis near the gastric outlet

Common symptoms of adult type pyloric stenosis include:^[5]

• Vomiting with occasional relief after vomiting
• Belching
• Epigastric pain

Less common symptoms of adult type pyloric stenosis include:^[5]

• Weight loss
• Symptoms of dehydration including:
  • Increased thirst
  • Dry mouth
  • Decreased urine output