Table 2 shows the top 46 ranked genes of the 13,966 genes whose correlation scores are greater than 0.01 with respect to the symptom of headache. We found that TNF and EDNRA are the causing genes for headache as listed in HPO. (the Italic font in Table 2, recall is 6.25% of the 32 genes). Here, TNF is linked to Headache.