NEWEST UPDATE: The first Tehillim (perek alef) is good for preventing miscarriage. The downloadable PDF has also been updated to show this.
UPDATE: As per a couple of suggestions I received, the list that appears below is now available as a 1-page PDF download. Please press the blue button to download this list:
For example, #27 is for wild animals and #118 facilitates giving an answer to an apikorus (a heretic). There are also quite a few that apply to specific ailments, both mental and physical.
With a lot of people suffering from minor to major ailments, it might be nice to know which perek (chapter) can be said for a specific ailment.
Note: The translation for kedachat isn't clear to me. I've seen it translated as "fever" or "malaria." To complicate things, the index calls different ailments kedachat revi'it (fourth fever/malaria) and so on. So I'm just leaving it as kedachat below.
If you know for sure, I'll hope you'll either send an email or leave the definition in the comments!
Also, there's a perek you say for the left leg/foot, but I didn't find anything for the right leg/foot. So I suppose you could just say 119:145-152 (kuf) for both. It can only help.
Unfortunately, I didn't see any for respiratory issues. (Or maybe that could be included in kedachat? Well, it can't hurt!)
Anyway, here's the list:
3 -- for shoulder pain and head pain
6 -- for eye illness
9 -- for a sick child
12 -- to prevent weakness
14 -- for fear (paranoia?)
31 -- for ayin hara
37 -- for a drunk person
47 -- to do teshuvah (repentance)
49 -- for kedachat
51 -- for one defiled with znut
59 -- for yetzer hara (the evil inclination)
61 -- if you are afraid to sit at home
67 -- for chronic kedachat
73 -- to be saved from fear
75 -- to humble one's arrogance/pride
84 -- for one whose body has grown thin from illness
86 -- to be saved from a ruach ra/bad spirit (depression?)
89 -- for a person who is losing their limbs (frostbite or gangrene or amputation?)
96 & 97 -- to infuse one's family members with simcha (happiness)
101 -- for a ruach ra/bad spirit (depression?)
102 & 103 -- for a barren woman
105 -- for "fourth kedachat"
106 -- for "third kedachat"
107 -- for chronic kedachat
117 -- to prevent one from dying an unusual death
119:9-16 (bet) -- for forgetfulness
119:17-24 (gimmel) -- for the right eye
119:25-32 (dalet) -- for the left eye
119:49-56 (zayin) -- for the spleen
119:57-64 (chet) -- for the upper stomach
119:65-72 (tet) -- for the right and left kidneys
119:81-88 (kaf) -- for the right nostril
119:97-104 (mem) -- for the right hand
119:121-128 (ayin) -- for the left hand
119:129-137 (pei) -- for the left nostril
119:145-152 (kuf) -- for the left leg/foot
119:153-160 (reish) -- for the right ear
119:161-168 (shin) -- for the head
119:169-176 (taf) -- for the left ear
127 -- for a newborn baby
128 -- for a pregnant lady
135 -- for one who has thoughts of avodah zara (occult, idolatry, etc.)
137 -- to rid oneself of hate
138 -- to rid oneself of arrogance/pride
141 -- for heart pain
142 -- for the thighs
143 -- for the arm
144 -- for a broken hand
145 -- for fear
146 -- for being struck with a sword (or with any sharp instrument, I'd guess)
147 -- for a snake bite
May we all merit a complete and speedy healing of body and soul.