Cast iron skillets are durable, versatile kitchen staples that can last generations, but they aren’t suited for every type of cooking. Certain foods and methods can damage the seasoning, cause rust, or leave unpleasant flavors behind, shortening the pan’s lifespan.

Acidic foods like tomatoes and vinegar, delicate fish, sticky sweet sauces, and eggs in poorly seasoned pans are common problems. These can strip seasoning, stick badly, or leave lingering odors. Strongly flavored foods such as curry or garlic can also transfer flavors to future dishes, especially desserts.

High-moisture practices are another risk. Boiling, steaming, storing food in the skillet, or shocking a hot pan with cold water can all weaken seasoning or cause rust and cracking. Cast iron performs best with dry or fat-based cooking and gradual temperature changes.

With proper care—drying thoroughly, lightly oiling after use, cleaning appropriately, and choosing the right foods—cast iron remains a powerful cooking tool. Avoiding a few key mistakes makes the difference between a skillet that improves with age and one that becomes damaged and frustrating to use.