Pizza Dough Has Bubbles – Normal or a Problem?

Which of these matches your situation?

Symptom, likely direction, and what to check next — a starting point, not a certain remote diagnosis.

What are these bubbles, exactly?

Yeast produces CO₂ during fermentation. Some of that gas gets held inside the dough's structure, forming gas cells of different sizes that show up as bubbles. How much becomes visible isn't just about yeast activity, though — the dough structure itself also determines whether and how well gas gets retained. A well-developed gluten structure holds gas differently than an underdeveloped dough — the kneading guide covers this in more detail. Visible bubbles are the result of several factors working together, not just one.

Bubbles in the dough ball

Small bubbles in a resting dough ball can be a normal sign of active fermentation. Individual larger bubbles aren't automatically a problem either — distribution within a dough ball is often uneven, without any identifiable reason. Important: the mere presence of visible bubbles doesn't reliably tell you on its own whether the dough is optimally fermented. There's no fixed rule like “X bubbles means it's ready” — fermentation timing depends on the recipe, temperature, and overall condition, not bubble count.

Should you press out bubbles?

It depends on the type of bubble, not a fixed rule. Small gas cells within the dough itself don't need special handling — they'll get redistributed while shaping anyway, and you don't need to try to preserve every single one. At the same time, the dough shouldn't be unnecessarily fully degassed, for example by kneading it hard again after fermentation; a practical balance is usually enough. Large surface bubbles are a bit different: if the bubble wall gets very thin, carefully and deliberately releasing it can make sense depending on the situation, to avoid an uncontrolled tear or localized burning during baking. Whether a bubble sits in what will become the middle or the rim makes a difference too — more on that in the sections below. There's no dogmatic rule of “always press out” or “never press out.”

Bubbles in the rim

While shaping, gas often moves toward the rim because the middle gets stretched thinner and pushes more gas out, while the rim stays less disturbed and tends to hold onto gas. That works out well with the puffy cornicione many pizza styles aim for. Still, large rim bubbles aren't automatically a mark of quality: a single, extremely thin-walled bubble can expand a lot while baking and burn locally before the rest of the rim finishes. A more even, medium-sized bubble structure is usually less conspicuous and less of a practical problem than one giant bubble — but that shouldn't be turned into a fixed “Instagram pizza” rule either, since looks and taste aren't necessarily linked. If the rim stays flat overall despite having bubbles, that often has further causes beyond raw bubble count — the dedicated guide Why Doesn't My Pizza Crust Puff Up? covers this in depth.

Bubbles during baking

If a very large bubble forms while baking, that's not immediately cause for concern — heat makes trapped gas expand quickly, which is a normal process in the oven. At the oven itself: watch rather than rush around, especially with a very hot stone, steel, or oven chamber. Only if a bubble gets genuinely problematically large or risks burning does a controlled, safe release make sense depending on the situation — using a suitable tool, without putting hands or arms in contact with hot surfaces. There's no need to pop every bubble that forms in the oven; most bake through just fine.

Bubbles and spreading

Lots of visible bubbles alone aren't proof of over-fermentation. It becomes relevant when several other traits show up together — noticeably weakening tension, spreading a lot while shaping, difficult handling, or dough that tears easily. In that case, the dough's overall condition is more telling than bubble count on its own. The detailed comparison of under- and over-proofing traits, including structure and tension, is in the tearing-dough guide — this article doesn't repeat it in full.

Hardly any visible bubbles

The absence of visible bubbles doesn't automatically mean the yeast is dead. Several factors play a role: current fermentation stage, temperature, the dough structure itself, handling while shaping, which surface you happen to be looking at, and simply the timing of when you check — right after kneading, naturally few bubbles are visible yet. If overall volume growth is also missing, that's a separate topic; the guide Pizza Dough Not Rising covers those cases in detail.

Bubbles while shaping

Shaping technique actively moves gas around the dough — while stretching, the middle usually gets pulled thinner than the edge, which pushes gas more toward the rim. How evenly that goes depends on general shaping technique; the guide to shaping dough round and the tearing-dough guide cover the stretching technique itself in detail — this section is only about gas distribution along the way. Particularly relevant: a large bubble in a very thin middle is structurally trickier than a small gas cell in the thicker rim, because there's already less reserve there against pressure and weight — see also the Thin Center section in the shaping guide.

Style differences

Not every pizza style aims for the same gas structure. Neapolitan pizza is often prized for a distinctly airy, irregularly large-holed cornicione. New York style usually has a more even, denser crumb with less dominant large bubbles, matching the foldable slice. Roman/tonda styles often sit somewhere in between. Pan styles like Detroit, Sicilian, or deep-dish have a different bubble picture anyway thanks to their thicker, pan-baked structure compared to a thin, open-baked pizza. There's no meaningful pore size or measurement to derive from this — it stays a style-dependent question.