| common symptom | 17 |
| early symptom | 15 |
| mild symptom | 6 |
| respiratory symptom | 3 |
| disease symptom | 2 |
| following symptom | 1 |
| their head | 0.44 |
| vary to another | 0.61 |
| vary in intensity | 0.57 |
| range | 0.55 |
| last for several weeks | 0.55 |
| vary | 0.55 |
| change over time | 0.54 |
| vary to person | 0.54 |
| go over time | 0.54 |
| vary among people | 0.54 |
| wane over time | 0.54 |
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| significant distress | 0.42 |
| anxiety | 0.37 |
| confusion | 0.36 |
| interference | 0.36 |
| significant problems | 0.35 |
| pain | 0.34 |
| concern | 0.33 |
| incredible discomfort | 0.31 |
| visible injury | 0.31 |
| swelling of the tooth | 0.31 |
| pain | 0.30 |
| other causes | 0.45 |
| effect | 0.38 |
| significant impact | 0.35 |
| negative impact | 0.33 |
| impact | 0.31 |
| investigation | 0.44 |
| medication | 0.43 |
| immediate medical atten… | 0.40 |
| treatment | 0.39 |
| hospitalization | 0.31 |
| medical attention | 0.30 |
| surgery | 0.29 |
| emergency treatment | 0.25 |
| mild | 0.70 |
| moderate | 0.60 |
| temporary | 0.60 |
| intermittent | 0.59 |
| new | 0.59 |
| less severe | 0.59 |
| severe | 0.58 |
| consistent | 0.58 |
| important | 0.57 |
| milder | 0.57 |
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| diagnosis | 0.49 |
| death | 0.40 |
| depression | 0.39 |
| weight loss | 0.36 |
| delay | 0.32 |
| disability | 0.32 |
| coma | 0.31 |
| problem | 0.29 |
| suicide | 0.27 |
| treated | 0.62 |
| experienced by patient | 0.60 |
| controlled | 0.59 |
| relieved | 0.58 |
| associated with anxiety | 0.58 |
| resolved | 0.58 |
| reduced | 0.58 |
| managed | 0.57 |
| mild to severe | 0.57 |
| experienced | 0.57 |
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| each other | 0.42 |
| digestive system | 0.41 |
| problem | 0.40 |
| behavior | 0.37 |
| duration | 0.36 |
| chronic fatigue syndrome | 0.34 |
| spinal stenosis | 0.28 |
| the genitourinary system | 0.27 |
| damaged or degenerative… | 0.26 |
| the flu | 0.39 |
| cold | 0.38 |
| other diseases | 0.37 |
| stroke | 0.36 |
| condition | 0.33 |
| dengue | 0.32 |
| alzheimer | 0.32 |
| parkinson’s disease | 0.27 |
| depression | 0.26 |