Tehilim for an illness

Question

What are the Chapters of Tehilim (Psalms) said for an ill person and what is the source in seforim and the reason for these particular chapters being chosen?

Answer 1

http://www.chabad.org/library/article_cdo/aid/1228223/jewish/Psalms-and-Jewish-Prayer-for-Healing.htm

When praying for an individual who is ill, it is customary to recite the following thirty-six chapters of Psalms: 20, 6, 9, 13, 16, 17, 18, 22, 23, 28, 30, 31, 32, 33, 37, 38, 39, 41, 49, 55, 56, 69, 86, 88, 89, 90, 91, 102, 103, 104, 107, 116, 118, 142, 143, and 148.

After this, recite the stanzas from Psalm 119 that correspond to the letters of the ill individual's Jewish name(s). (Psalm 119 is an acrostic containing twenty-two stanzas, each stanza consisting of eight verses that begin with the same letter from the Hebrew alphabet. The first eight verses all start with the letter aleph, the next eight begin with bet, the next eight with gimel, etc.) E.g., if the person's name is Moshe (משה), recite the stanzas that begin with mem, shin, and hey. If the person's name is Rachel (רחל), recite the stanzas that begin with resh, chet and lamed.