| 5-HT | Serotonin |
| DMN | Default mode network |
| FM | Fibromyalgia |
| GABA | γ-Amino-butyric-acid |
| IC | Insular cortex |
| MLN | Milnacipran |
| fMRI | Functional magnetic resonance imaging |
| NE | Norepinephrine |
| rs-fc | Resting state functional connectivity |
| US | Unconditioned stimulus |
| CS | Conditioned stimulus |
| CBP | Chronic back pain |
| HCs | Healthy controls |
| IBS | Irritable bowel syndrome |
| EULAR | European League against Rheumatism |
| IPL | Inferior parietal lobule |
| ACC | Anterior cingulate cortex |
| BPI Int | Brief Pain Inventory interference scores |
| NMDA | N-Methyl-D-Aspartat |
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