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What Causes Mouth Ulcers?

Public survey, 209028 votes for 275 causes since October 2002.

275 Causes, votes, since.
Currently sorted by Definite in descending order
Causes them Exacerbates No effect
Stress (2444 votes since 27 Sep 02) 66% (1622) 27% (661) 7% (161)
Generally run down (1715 votes since 9 Feb 03) 64% (1091) 27% (457) 10% (167)
Already having ulcers (i.e Multiplying) (257 votes since 22 Sep 06) 53% (136) 24% (62) 23% (59)
Drop In Immune System (1351 votes since 20 Apr 03) 46% (628) 37% (494) 17% (229)
Tissue Damage in the Mouth before (44 votes since 31 Jan 08) 43% (19) 25% (11) 32% (14)
Physically & mentally exhausted (461 votes since 2 Aug 05) 43% (199) 32% (148) 25% (114)
Anxiety (1058 votes since 11 Sep 03) 43% (451) 34% (360) 23% (247)
Abrasions, cuts or bites to mouth or tongue (10204 votes since 19 Nov 02) 40% (4076) 23% (2358) 37% (3770)
feeling mentally and physically low (427 votes since 24 Aug 05) 40% (170) 29% (124) 31% (133)
Lack of sleep (or poor sleep) (2705 votes since 27 Sep 02) 38% (1032) 41% (1108) 21% (565)
Having a Brace or Dental treatment (1309 votes since 6 Apr 03) 35% (464) 23% (306) 41% (539)
Lack of Health (vitamin defficiency (1124 votes since 11 Jun 03) 35% (395) 37% (419) 28% (310)
During a cold or flu (1109 votes since 30 Jun 03) 35% (385) 33% (368) 32% (356)
Worry over forthcoming event (292 votes since 11 May 06) 34% (100) 32% (92) 34% (100)
Being intensely upset for short time (238 votes since 11 Sep 06) 31% (74) 23% (55) 46% (109)
Poor dental/mouth hygiene (962 votes since 6 Sep 03) 31% (299) 34% (326) 35% (337)
pressure at work (297 votes since 2 Jun 06) 31% (92) 35% (103) 34% (102)
Hereditary (parents & children suffer) (607 votes since 28 Oct 04) 31% (186) 28% (167) 42% (254)
Bacteria (1809 votes since 23 Nov 02) 29% (525) 48% (876) 23% (408)
chewing tongue (201 votes since 28 Nov 06) 28% (57) 17% (35) 54% (109)
Worrying about money (217 votes since 22 Sep 06) 28% (61) 29% (62) 43% (94)
Braces (784 votes since 31 Mar 05) 28% (218) 16% (122) 57% (444)
Acidic foods & drinks (2114 votes since 23 Feb 03) 27% (577) 32% (666) 41% (871)
Genetic pre-disposition (1376 votes since 23 Feb 03) 26% (363) 34% (472) 39% (541)
Burns or scalds to mouth (1688 votes since 24 Jan 06) 26% (445) 27% (453) 47% (790)
Depression (997 votes since 19 Aug 03) 26% (259) 40% (400) 34% (338)
worrying over phobia/getting worked up (252 votes since 5 Aug 06) 26% (65) 33% (83) 41% (104)
Prelude to another illness (1512 votes since 29 Jan 03) 26% (390) 41% (623) 33% (499)
cutting gums with toothbrush (47 votes since 4 Jan 08) 26% (12) 26% (12) 49% (23)
BEFORE a cold/sore throat (60 votes since 25 Nov 07) 25% (15) 28% (17) 47% (28)
Wisdom teeth / dental problems (857 votes since 14 Sep 03) 25% (212) 24% (204) 51% (441)
After a cold (1540 votes since 26 Jan 03) 24% (373) 41% (630) 35% (537)
Citric acid (1496 votes since 4 Mar 03) 23% (349) 27% (408) 49% (739)
Throat infection that moved to mouth (1287 votes since 6 Apr 03) 23% (300) 35% (447) 42% (540)
Hormonal cycle (1604 votes since 27 Nov 02) 22% (355) 38% (608) 40% (641)
crisps/chips (especially with 622 flavor (23 votes since 11 Mar 08) 22% (5) 26% (6) 52% (12)
Orange juice (1837 votes since 27 Sep 02) 21% (384) 32% (582) 47% (871)
Oranges (890 votes since 26 Oct 03) 20% (181) 21% (183) 59% (526)
Food acids (15 votes since 4 Apr 08) 20% (3) 33% (5) 47% (7)
Allergies (264 votes since 16 May 06) 19% (51) 25% (65) 56% (148)
Before period (females) hormonal change (836 votes since 30 Oct 03) 19% (159) 28% (231) 53% (446)
irregular brushing of teeth? (1056 votes since 27 Jun 03) 19% (200) 31% (332) 50% (524)
Tomatoes (1705 votes since 8 Nov 02) 19% (317) 26% (448) 55% (940)
After period (females) hormonal change (565 votes since 9 Nov 04) 18% (104) 29% (166) 52% (295)
Food Allergy (942 votes since 5 Aug 03) 18% (171) 30% (280) 52% (491)
Lemons (560 votes since 7 Jan 05) 18% (100) 18% (103) 64% (357)
Sugar and too much sugary food (641 votes since 10 Aug 04) 17% (111) 27% (174) 56% (356)
following dentl surgery (170 votes since 6 Jan 07) 17% (29) 14% (23) 69% (118)
grapefruit (751 votes since 21 Jan 04) 17% (127) 18% (136) 65% (488)
Glandular Fever (12 votes since 17 Apr 08) 17% (2) 17% (2) 67% (8)
Gastric reflux (920 votes since 25 Jun 04) 17% (153) 27% (245) 57% (522)
Manual teeth brushing (1223 votes since 30 Apr 03) 17% (203) 30% (370) 53% (650)
ph balance in mouth (531 votes since 18 Jan 05) 17% (88) 41% (218) 42% (225)
stomach bug (206 votes since 30 Sep 06) 17% (34) 20% (42) 63% (130)
Lack of Vitamin B (1651 votes since 14 Nov 02) 16% (272) 58% (957) 26% (422)
Pineapple (1908 votes since 15 Jan 03) 16% (313) 21% (408) 62% (1187)
TMJ/teeth grinding (605 votes since 18 Aug 04) 16% (99) 28% (169) 56% (337)
Virus (765 votes since 27 Dec 04) 16% (121) 31% (236) 53% (408)
Sour Candy ie Sour Patch Kids (268 votes since 12 Apr 06) 16% (42) 16% (43) 68% (183)
Spicy, hot food (298 votes since 1 Apr 06) 15% (46) 17% (52) 67% (200)
Dry Mouth (425 votes since 15 Jun 05) 15% (65) 25% (107) 60% (253)
Vitamin C deficiency (1319 votes since 27 Dec 03) 15% (193) 46% (605) 39% (521)
OCD (Eating Mouth) (138 votes since 29 Mar 07) 14% (20) 14% (19) 72% (99)
Tissue drying out during dental work (246 votes since 22 Jun 06) 14% (35) 17% (42) 69% (169)
raw tomatoes (64 votes since 14 Nov 07) 14% (9) 23% (15) 63% (40)
Full mouth dentures (976 votes since 17 Jun 03) 14% (135) 19% (184) 67% (657)
Dehydration (1017 votes since 3 Jul 03) 14% (139) 32% (326) 54% (552)
Tomato Ketchup (843 votes since 26 Oct 03) 14% (115) 18% (155) 68% (573)
Chronic fatigue syndrome / ME (1087 votes since 10 May 03) 13% (146) 30% (329) 56% (612)
sensitive skin inside & out? (576 votes since 21 Sep 04) 13% (76) 27% (158) 59% (342)
Reaction to Antibiotics (1218 votes since 6 Apr 03) 13% (158) 29% (352) 58% (708)
After finals or midterms (703 votes since 26 Jan 04) 13% (91) 22% (154) 65% (458)
Herpes simplex (1337 votes since 19 Jul 03) 13% (168) 26% (343) 62% (826)
Spicy Foods (Curries) (1244 votes since 19 Apr 03) 13% (156) 22% (270) 66% (818)
skittles (369 votes since 2 Sep 05) 12% (46) 14% (50) 74% (273)
Toothpaste with SLS (1904 votes since 27 Sep 02) 12% (236) 45% (850) 43% (818)
dentist (138 votes since 30 Apr 07) 12% (17) 19% (26) 69% (95)
Chocolate (3475 votes since 30 Dec 02) 12% (428) 22% (761) 66% (2286)
Anaemia/low levels of stored iron (431 votes since 25 May 05) 12% (53) 34% (148) 53% (230)
Dirty fingers in mouth (1204 votes since 11 May 04) 12% (146) 27% (325) 61% (733)
Iron deficiency (1362 votes since 19 Feb 03) 12% (165) 52% (714) 35% (483)
Losing temper / anger (842 votes since 1 Nov 03) 12% (102) 25% (207) 63% (533)
Lack Of Veg (527 votes since 10 Feb 05) 12% (63) 31% (166) 57% (298)
Low B12 in blood work (772 votes since 2 Dec 03) 12% (92) 37% (287) 51% (393)
when glands play up (581 votes since 16 Sep 04) 12% (69) 29% (167) 59% (345)
Sweets (2529 votes since 15 Jan 03) 12% (299) 24% (617) 64% (1613)
Glandular fever (1390 votes since 10 May 03) 12% (164) 28% (383) 61% (843)
Zinc deficiency (1560 votes since 14 Nov 02) 12% (183) 60% (929) 29% (448)
Fizzy Sherbert (alone or coating sweets) (312 votes since 6 Jan 06) 12% (36) 14% (44) 74% (232)
onions (26 votes since 29 Feb 08) 12% (3) 4% (1) 85% (22)
vitamin b2 deficiency (373 votes since 1 Sep 05) 12% (43) 42% (158) 46% (172)
Lips too dry (564 votes since 15 Dec 04) 12% (65) 26% (148) 62% (351)
Salt (255 votes since 1 Jul 06) 11% (29) 18% (46) 71% (180)
fever (445 votes since 7 May 05) 11% (50) 24% (109) 64% (286)
auto-immune disease (hypothyroid) (503 votes since 18 Jan 05) 11% (54) 22% (112) 67% (337)
Not eating enough fruit (441 votes since 29 Jun 05) 11% (47) 38% (167) 51% (227)
Oral Sex (1268 votes since 15 Apr 03) 10% (133) 20% (259) 69% (876)
Acid build up - need more protein intake (251 votes since 28 Apr 06) 10% (26) 22% (55) 68% (170)
ketchup or mayanaise (699 votes since 5 Mar 04) 10% (72) 15% (105) 75% (522)
Catching them from someone else (526 votes since 14 Jun 05) 10% (54) 13% (69) 77% (403)
Mouth shut and still for many hours (39 votes since 9 Jan 08) 10% (4) 15% (6) 74% (29)
Smoking (1176 votes since 25 Apr 03) 10% (117) 19% (219) 71% (840)
illegal drug use (speed) (936 votes since 30 Jun 03) 10% (93) 16% (151) 74% (692)
Sodium Lauryl/Lauryth Sulfate (364 votes since 26 Aug 05) 10% (36) 23% (84) 67% (244)
hand, foot, mouth disease (801 votes since 14 Sep 03) 10% (79) 15% (117) 76% (605)
SHORT BLOOD PRES. ELEVATION , ANGER (530 votes since 28 Nov 04) 10% (52) 22% (117) 68% (361)
Giving up smoking (1481 votes since 25 Feb 03) 10% (144) 14% (208) 76% (1129)
Coke - not just any fizzy drink (1115 votes since 25 May 03) 10% (107) 20% (221) 71% (787)