Нерв болить.

• нерв = nerve
• болить = hurts / is aching / is painful

So the sentence means The nerve hurts or, depending on context, A nerve hurts.

Because with боліти the thing that hurts is usually the grammatical subject in Ukrainian.

So Ukrainian structures this like:

• Нерв болить = The nerve hurts
• Зуб болить = The tooth hurts
• Голова болить = The head hurts / I have a headache

That is different from some English patterns like My leg hurts me, where English can treat the person more centrally. In Ukrainian, the painful body part often stands in the nominative.

Болить is the 3rd person singular form of the verb боліти.

So:

• боліти = to hurt / to ache
• болить = hurts / aches

It agrees with нерв, which is singular.

A few related forms:

• я болю = I hurt (less common in this kind of body-part meaning)
• він / вона / воно болить = it hurts
• нерви болять = the nerves hurt would use the plural verb болять

Ukrainian often leaves out possessive words when the meaning is obvious from context, especially with body parts and health.

So Нерв болить can naturally mean:

• The nerve hurts
• My nerve hurts, if the situation already makes that clear

If you want to make it explicit, you can say:

• Мій нерв болить = My nerve hurts

But in real speech, Ukrainians often prefer a structure with у мене:

• У мене болить нерв = My nerve hurts / I have a painful nerve

That version often sounds more natural in everyday conversation.

Нерв болить is grammatically correct, but by itself it can sound a bit bare or context-dependent.

Very often, a speaker would say:

• У мене болить нерв = My nerve hurts
• Болить нерв = The nerve hurts / A nerve hurts
• У мене нерв болить = another natural spoken order, with emphasis on у мене

So yes, Нерв болить is possible, but in normal conversation you may hear a version with у мене more often.

Literally, у мене болить нерв is something like At me, a nerve hurts.

This у мене pattern is extremely common in Ukrainian for talking about physical pain:

• У мене болить голова = My head hurts
• У мене болить зуб = My tooth hurts
• У мене болить спина = My back hurts

English speakers often want to say мій + body part, but Ukrainian very often prefers у мене + болить + body part.

Yes. Ukrainian word order is fairly flexible, and changing it can affect emphasis more than basic meaning.

Possible variants:

• Нерв болить = neutral, simple statement
• Болить нерв = puts the verb first; often sounds natural in speech
• У мене болить нерв = very common everyday wording
• У мене нерв болить = emphasizes my nerve or contrasts with something else

All of these can be correct depending on context.

A rough English-style approximation is:

nerv bo-LYT'

A bit more carefully:

• нерв = nerv
• болить = bo-LYT'

Notes:

• The stress is on the last syllable of болить: болИть
• The final ть is a soft consonant, so it is not exactly the same as a hard English t

Mostly it is used for physical pain or aching, especially with body parts. For example:

• Серце болить = literally The heart hurts

But that can also sometimes be emotional or figurative depending on context.

In Нерв болить, the most natural reading is physical pain.

If you are talking about more than one nerve, you use plural noun and plural verb:

• Нерви болять = The nerves hurt

Compare:

• нерв болить = singular
• нерви болять = plural

This is a useful pattern to remember:

• singular subject → болить
• plural subject → болять

Not always. Нерв can be:

• a literal nerve in the body
• part of expressions related to nerves in the sense of stress or emotional tension

But in Нерв болить, the default reading is the literal medical one: a physical nerve hurts.

They are related, but not the same.

• Нерв болить = The nerve hurts
  This names the body part or specific source of pain.

• Мені боляче = It hurts / I am in pain
  This focuses on the person experiencing pain, without naming the body part.

So if you want to specify what hurts, болить with a subject is very common. If you want to say only that you are in pain, мені боляче is often the better choice.