Nuts are generally reflux-friendly in moderate portions — they're not acidic, and most are low enough in fat per serving to avoid the pressure-and-slowed-digestion problem that high-fat foods cause. Almonds in particular are sometimes mentioned as mildly alkaline, though the effect of a handful of nuts on overall stomach acidity is small.
Where nuts can go wrong
Portion size is the main risk — a large handful of any nut adds up in fat content quickly, and nut butters (especially those with added oils) can be more concentrated than the whole nut. Some nuts, like macadamias and cashews, are higher in fat than almonds or walnuts, so they're worth watching more closely if you're sensitive.
A reasonable approach
A small handful (roughly a quarter cup) of almonds or walnuts as a snack, or a thin spread of natural nut butter on toast, is a level most people with reflux tolerate well. Roasted, salted nuts in large bags are easier to overeat than raw or lightly salted ones, so portioning them out ahead of time helps more than trying to exercise willpower mid-snack.
If a specific nut consistently causes symptoms for you, that's more useful information than any general list — track it and adjust from there.
