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What Causes Mouth Ulcers?

Public survey, 210434 votes for 281 causes since October 2002.

281 Causes, votes, since.
Currently sorted by Definite in descending order
Causes them Exacerbates No effect
Stress (2453 votes since 27 Sep 02) 66% (1629) 27% (662) 7% (162)
Generally run down (1722 votes since 9 Feb 03) 64% (1096) 27% (459) 10% (167)
Already having ulcers (i.e Multiplying) (262 votes since 22 Sep 06) 53% (139) 24% (63) 23% (60)
Drop In Immune System (1358 votes since 20 Apr 03) 47% (633) 37% (496) 17% (229)
Physically & mentally exhausted (465 votes since 2 Aug 05) 43% (202) 32% (148) 25% (115)
Anxiety (1063 votes since 11 Sep 03) 43% (454) 34% (360) 23% (249)
Tissue Damage in the Mouth before (48 votes since 31 Jan 08) 42% (20) 25% (12) 33% (16)
feeling mentally and physically low (431 votes since 24 Aug 05) 40% (173) 29% (124) 31% (134)
Abrasions, cuts or bites to mouth or tongue (10212 votes since 19 Nov 02) 40% (4081) 23% (2360) 37% (3771)
Lack of sleep (or poor sleep) (2714 votes since 27 Sep 02) 38% (1036) 41% (1111) 21% (567)
Having a Brace or Dental treatment (1315 votes since 6 Apr 03) 35% (465) 23% (308) 41% (542)
Lack of Health (vitamin defficiency (1129 votes since 11 Jun 03) 35% (398) 37% (421) 27% (310)
During a cold or flu (1114 votes since 30 Jun 03) 35% (387) 33% (369) 32% (358)
Worry over forthcoming event (296 votes since 11 May 06) 34% (101) 31% (93) 34% (102)
Being intensely upset for short time (242 votes since 11 Sep 06) 31% (76) 23% (56) 45% (110)
Poor dental/mouth hygiene (967 votes since 6 Sep 03) 31% (301) 34% (327) 35% (339)
pressure at work (301 votes since 2 Jun 06) 31% (93) 35% (105) 34% (103)
Hereditary (parents & children suffer) (612 votes since 28 Oct 04) 31% (187) 27% (168) 42% (257)
Bacteria (1816 votes since 23 Nov 02) 29% (527) 48% (879) 23% (410)
Worrying about money (221 votes since 22 Sep 06) 29% (63) 29% (63) 43% (95)
chewing tongue (205 votes since 28 Nov 06) 28% (58) 18% (37) 54% (110)
Braces (789 votes since 31 Mar 05) 28% (220) 16% (123) 57% (446)
Acidic foods & drinks (2122 votes since 23 Feb 03) 27% (579) 32% (669) 41% (874)
Burns or scalds to mouth (1692 votes since 24 Jan 06) 26% (447) 27% (454) 47% (791)
Genetic pre-disposition (1381 votes since 23 Feb 03) 26% (364) 34% (473) 39% (544)
worrying over phobia/getting worked up (256 votes since 5 Aug 06) 26% (67) 33% (84) 41% (105)
Depression (1002 votes since 19 Aug 03) 26% (261) 40% (400) 34% (341)
Prelude to another illness (1519 votes since 29 Jan 03) 26% (393) 41% (627) 33% (499)
cutting gums with toothbrush (51 votes since 4 Jan 08) 25% (13) 27% (14) 47% (24)
BEFORE a cold/sore throat (64 votes since 25 Nov 07) 25% (16) 31% (20) 44% (28)
Wisdom teeth / dental problems (862 votes since 14 Sep 03) 25% (213) 24% (206) 51% (443)
After a cold (1547 votes since 26 Jan 03) 24% (374) 41% (634) 35% (539)
Throat infection that moved to mouth (1293 votes since 6 Apr 03) 23% (302) 35% (450) 42% (541)
Citric acid (1503 votes since 4 Mar 03) 23% (351) 27% (409) 49% (743)
Hormonal cycle (1611 votes since 27 Nov 02) 22% (356) 38% (612) 40% (643)
Orange juice (1846 votes since 27 Sep 02) 21% (385) 32% (585) 47% (876)
Oranges (895 votes since 26 Oct 03) 20% (181) 21% (185) 59% (529)
Allergies (268 votes since 16 May 06) 20% (53) 24% (65) 56% (150)
Before period (females) hormonal change (841 votes since 30 Oct 03) 19% (160) 28% (233) 53% (448)
irregular brushing of teeth? (1061 votes since 27 Jun 03) 19% (201) 32% (335) 49% (525)
Glandular Fever (16 votes since 17 Apr 08) 19% (3) 25% (4) 56% (9)
Tomatoes (1714 votes since 8 Nov 02) 19% (318) 26% (451) 55% (945)
crisps/chips (especially with 622 flavor (27 votes since 11 Mar 08) 19% (5) 33% (9) 48% (13)
After period (females) hormonal change (570 votes since 9 Nov 04) 18% (105) 29% (168) 52% (297)
Food Allergy (947 votes since 5 Aug 03) 18% (173) 30% (281) 52% (493)
Lemons (565 votes since 7 Jan 05) 18% (100) 19% (106) 64% (359)
Sugar and too much sugary food (646 votes since 10 Aug 04) 17% (112) 27% (175) 56% (359)
stomach bug (210 votes since 30 Sep 06) 17% (36) 20% (42) 63% (132)
grapefruit (756 votes since 21 Jan 04) 17% (127) 18% (137) 65% (492)
following dentl surgery (174 votes since 6 Jan 07) 17% (29) 14% (24) 70% (121)
ph balance in mouth (536 votes since 18 Jan 05) 17% (89) 41% (220) 42% (227)
Gastric reflux (926 votes since 25 Jun 04) 17% (153) 27% (246) 57% (527)
Manual teeth brushing (1229 votes since 30 Apr 03) 17% (203) 30% (371) 53% (655)
Lack of Vitamin B (1659 votes since 14 Nov 02) 16% (273) 58% (961) 26% (425)
Pineapple (1917 votes since 15 Jan 03) 16% (314) 21% (410) 62% (1193)
TMJ/teeth grinding (610 votes since 18 Aug 04) 16% (99) 28% (169) 56% (342)
Virus (770 votes since 27 Dec 04) 16% (123) 31% (238) 53% (409)
Food acids (19 votes since 4 Apr 08) 16% (3) 37% (7) 47% (9)
Sour Candy ie Sour Patch Kids (272 votes since 12 Apr 06) 15% (42) 17% (45) 68% (185)
Spicy, hot food (302 votes since 1 Apr 06) 15% (46) 18% (54) 67% (202)
Dry Mouth (429 votes since 15 Jun 05) 15% (65) 25% (108) 60% (256)
OCD (Eating Mouth) (142 votes since 29 Mar 07) 15% (21) 13% (19) 72% (102)
Vitamin C deficiency (1324 votes since 27 Dec 03) 15% (193) 46% (607) 40% (524)
Tissue drying out during dental work (250 votes since 22 Jun 06) 14% (35) 17% (42) 69% (173)
Full mouth dentures (981 votes since 17 Jun 03) 14% (135) 19% (185) 67% (661)
Dehydration (1022 votes since 3 Jul 03) 14% (140) 32% (326) 54% (556)
Tomato Ketchup (848 votes since 26 Oct 03) 14% (115) 19% (157) 68% (576)
Chronic fatigue syndrome / ME (1093 votes since 10 May 03) 13% (147) 30% (329) 56% (617)
sensitive skin inside & out? (581 votes since 21 Sep 04) 13% (77) 27% (159) 59% (345)
raw tomatoes (68 votes since 14 Nov 07) 13% (9) 24% (16) 63% (43)
Reaction to Antibiotics (1224 votes since 6 Apr 03) 13% (158) 29% (352) 58% (714)
After finals or midterms (708 votes since 26 Jan 04) 13% (91) 22% (157) 65% (460)
Herpes simplex (1342 votes since 19 Jul 03) 13% (168) 26% (344) 62% (830)
Spicy Foods (Curries) (1250 votes since 19 Apr 03) 12% (156) 22% (272) 66% (822)
Anaemia/low levels of stored iron (436 votes since 25 May 05) 12% (54) 34% (149) 53% (233)
Toothpaste with SLS (1913 votes since 27 Sep 02) 12% (236) 44% (851) 43% (826)
skittles (373 votes since 2 Sep 05) 12% (46) 13% (50) 74% (277)
Chocolate (3484 votes since 30 Dec 02) 12% (429) 22% (763) 66% (2292)
Losing temper / anger (847 votes since 1 Nov 03) 12% (103) 24% (207) 63% (537)
Dirty fingers in mouth (1209 votes since 11 May 04) 12% (147) 27% (328) 61% (734)
Iron deficiency (1369 votes since 19 Feb 03) 12% (166) 52% (716) 36% (487)
when glands play up (586 votes since 16 Sep 04) 12% (71) 29% (168) 59% (347)
Lack Of Veg (532 votes since 10 Feb 05) 12% (64) 31% (166) 57% (302)
dentist (142 votes since 30 Apr 07) 12% (17) 20% (28) 68% (97)
Low B12 in blood work (777 votes since 2 Dec 03) 12% (92) 37% (289) 51% (396)
Glandular fever (1396 votes since 10 May 03) 12% (165) 28% (384) 61% (847)
Sweets (2536 votes since 15 Jan 03) 12% (299) 24% (619) 64% (1618)
Zinc deficiency (1567 votes since 14 Nov 02) 12% (183) 60% (933) 29% (451)
fever (450 votes since 7 May 05) 12% (52) 24% (110) 64% (288)
Lips too dry (569 votes since 15 Dec 04) 11% (65) 26% (149) 62% (355)
vitamin b2 deficiency (377 votes since 1 Sep 05) 11% (43) 42% (160) 46% (174)
Fizzy Sherbert (alone or coating sweets) (316 votes since 6 Jan 06) 11% (36) 14% (45) 74% (235)
Salt (259 votes since 1 Jul 06) 11% (29) 19% (48) 70% (182)
gluten (18 votes since 30 Mar 08) 11% (2) 22% (4) 67% (12)
auto-immune disease (hypothyroid) (508 votes since 18 Jan 05) 11% (54) 22% (113) 67% (341)
Acid build up - need more protein intake (255 votes since 28 Apr 06) 11% (27) 22% (55) 68% (173)
Not eating enough fruit (445 votes since 29 Jun 05) 11% (47) 38% (169) 51% (229)
Oral Sex (1274 votes since 15 Apr 03) 10% (133) 20% (260) 69% (881)
Catching them from someone else (530 votes since 14 Jun 05) 10% (55) 13% (69) 77% (406)
ketchup or mayanaise (704 votes since 5 Mar 04) 10% (72) 15% (107) 75% (525)
onions (30 votes since 29 Feb 08) 10% (3) 10% (3) 80% (24)
illegal drug use (speed) (940 votes since 30 Jun 03) 10% (94) 16% (152) 74% (694)
SHORT BLOOD PRES. ELEVATION , ANGER (535 votes since 28 Nov 04) 10% (53) 22% (117) 68% (365)
Smoking (1182 votes since 25 Apr 03) 10% (117) 19% (220) 71% (845)
hand, foot, mouth disease (806 votes since 14 Sep 03) 10% (79) 15% (119) 75% (608)
Sodium Lauryl/Lauryth Sulfate (368 votes since 26 Aug 05) 10% (36) 23% (84) 67% (248)
Giving up smoking (1487 votes since 25 Feb 03) 10% (144) 14% (208) 76% (1135)
Coke - not just any fizzy drink (1121 votes since 25 May 03) 10% (107) 20% (224) 70% (790)