A swollen milk container may seem like a small problem, but it can be an important warning that the milk is no longer safe to drink. When microorganisms grow inside milk, they can produce gases that cause the container to puff up. This can happen even before the printed expiration date, especially if the milk has not been kept cold enough or the packaging has been damaged.

Before using milk, take a moment to check the container. Look for swelling, leaks, cracks, or a broken seal. After opening it, pay attention to its appearance and smell. Milk that has curdled, changed color, separated unusually, or developed an unpleasant odor may have spoiled. The article emphasizes that you should not taste milk simply to determine whether it is still good.

If you purchase milk and notice that the container is already swollen, it is better to return it to the store rather than take a chance. Keeping the receipt and taking a photo of the packaging can make a refund or replacement easier. Remember that the expiration date is not an absolute guarantee of freshness, because storage conditions can affect how quickly milk deteriorates.

Proper refrigeration is one of the easiest ways to keep milk fresh. The article recommends keeping milk at **“40°F (4°C) or below”** and storing it toward the back of the refrigerator instead of in the door, where temperatures can fluctuate more.

Ultimately, a swollen milk container is a sign worth taking seriously. If the milk looks or smells abnormal, the safest decision is to throw it away rather than risk drinking spoiled milk.