White staining on the outside of your chimney, called efflorescence, is a common sign that moisture is getting in and your chimney needs attention. You might also notice rust on the damper or firebox, which indicates water problems. Strong odors coming from your fireplace, especially during humid weather, usually mean creosote buildup is present. If you see animals or birds around your chimney, or hear sounds inside, there could be blockages that need clearing. Poor draft, where smoke enters your room instead of going up the chimney, is another clear indicator. Any visible damage to the chimney crown or cap should be addressed immediately to prevent water damage and safety hazards.