A mango that looks dark, brown, or mushy inside typically has one of a few problems: it was stored too cold, it developed a physiological breakdown during growth, or it has a fungal infection. The good news is that most causes are easy to identify once you know what to look for, and in many cases the fruit is still partially salvageable.
Cold Storage Damage
The most common reason a store-bought mango is dark inside is chilling injury from refrigeration. Mangoes are tropical fruits, and their cells start breaking down when stored below about 10°C (50°F). If your mango spent time in a too-cold warehouse, shipping container, or your home fridge before it was ripe, the internal damage can show up as brown streaks running along the vascular fibers, the thin lines that carry water and nutrients through the flesh. This browning often appears throughout the fruit rather than in one concentrated spot.
Chilling injury can develop in as little as two weeks at 7°C (about 45°F), and the damage gets worse the longer the fruit stays cold. Mangoes stored at the recommended temperature of 13°C (55°F) don’t develop these symptoms at all. The tricky part is that the outside of the fruit can look perfectly normal while the inside is already browning. You won’t know until you cut it open.
If you bought a mango that isn’t ripe yet, keep it on the counter at room temperature. Only move it to the fridge once it’s fully ripe and soft to the touch. At that point, ripe fruit can handle temperatures down to about 7°C (44°F) for a few days without damage.
Darkening Around the Seed
If the dark area is concentrated right around the pit, you’re likely looking at a condition called jelly seed. The flesh near the stone breaks down into a soft, jelly-like mass that turns brown. This happens because of a calcium deficiency in the fruit while it was still on the tree. Without enough calcium, the cell walls in the inner flesh weaken and collapse. Jelly seed is more common in certain varieties and in fruit that ripened in very hot conditions.
A related problem, stem-end cavity, starts at the top of the fruit where the stem attaches. Natural tannin compounds deposit in the tissue and cause discoloration, followed by a soft, hollow cavity that turns brown or black. This is also tied to mineral imbalances in the tree and tends to show up in varieties like Tommy Atkins and Irwin.
Darkening at the Bottom Tip
When the dark, mushy area is at the bottom (the pointed end opposite the stem), the condition is called soft nose. The flesh at the tip softens, yellows, and eventually turns brown as the cells break down. Like jelly seed, soft nose stems from localized calcium deficiency, this time in the far end of the fruit where calcium has the hardest time reaching through the fruit’s vascular system. Ripening hormones accelerate the breakdown, which is why you often don’t notice it until the mango is fully ripe.
Fungal Infection
Dark patches that look sunken, black, and clearly rotting point to anthracnose, the most common fungal disease in mangoes worldwide. The fungus infects the fruit while it’s still on the tree, then sits dormant until the mango ripens. As ripening begins, black, sunken lesions appear on the skin and can penetrate deep into the flesh. If you peel the skin and see dark lesions extending into the pulp underneath, that’s the fungus working its way inward.
In more advanced cases, large cracks form at the surface lesions, giving the fungus a direct path into the center of the fruit. This type of darkening tends to be irregular and patchy rather than uniform, and it often has a distinctly off smell.
Is It Safe to Eat?
If you see just a few small brown spots or a limited area of darkened flesh, you can cut those portions away with a knife and eat the rest. The unaffected flesh is fine. Physiological disorders like jelly seed and soft nose aren’t caused by pathogens, so the brown areas aren’t toxic, just unpleasant in taste and texture.
If the darkening is widespread, running through most of the flesh, the flavor will likely be off and the texture unappetizing. At that point, even though it may technically be safe, it’s not worth eating. Take it back to the store for a refund. Letting your grocer know about these problems helps them identify issues with their suppliers or storage practices.
If the mango smells fermented, sour, or alcoholic, or if you see fuzzy mold growing on the surface or inside, discard it entirely.
How to Avoid It Next Time
Choose mangoes that feel heavy for their size and give slightly when pressed near the stem. A sweet, fruity smell at the stem end is a good sign. Avoid fruit with large black spots on the skin, since these can indicate anthracnose lesions that have already penetrated the flesh.
Once home, let unripe mangoes sit at room temperature until they soften and develop a strong fragrance. This usually takes three to five days. Refrigerating too early is the single most common mistake. Once ripe, mangoes keep in the fridge for about five days. The ideal storage range for unripe fruit is 10 to 13°C (50 to 55°F) with high humidity, which gives a shelf life of two to four weeks, but since most home fridges run around 4°C (39°F), they’re far too cold for green mangoes.
Varieties matter too. Tommy Atkins, one of the most widely sold mangoes in the U.S., is more prone to internal disorders than varieties like Ataulfo (also called honey or champagne mango), which has a smaller seed, denser flesh, and tends to show fewer internal problems.