Suffer from sth 因……而痛苦。 常加具体的不幸或痛苦的名词，表示遭受战争、自然灾害、疾病带来的苦难。如overwork, drinking（因受酗酒而受苦）,headache, floods(遭受水灾)等。表示“苦于……，患有某种疾病；为……所苦/所困扰；受……的折磨；感到疼痛、遭受痛苦；受痛苦、受苦难”，尤其指长期或习惯性地。

▲  suffer from+disease患有……疾病；遭受（某种疾病）之苦

Sometimes I suffer from toothaches.有时我遭受牙疼之苦。

It is said that he suffers from high blood pressure.据说他患有高血压。

He suffers from several diseases at present.目前他身患几种疾病。

She often suffers from headaches.她经常头痛。

Many old people suffer from the loss of memory.很多老年人患有失意症。

Do you often suffer from headaches?你常头疼吗？

 The little boy is suffering from a bad flu bug again. 那个小孩又再患了严重的感冒。

△suffer from cold and hunger受饥寒交迫之苦；挨饿受冻

He is suffering from cold and hunger.他正挨饿受冻。

Our business has suffered from lack of investment.我们的企业因缺乏投资而日子不好过。

The country has always suffered from floods and drought.这个国家经常遭受水旱灾害。

Sometimes I still suffer from these weaknesses.有时我还是在吃这些弱点的苦头。

I'm suffering from a real lack of time this week. 我这周为时间不够用而苦。

[考题]My grandmother_____________________（患有）a stange headache since last week.

(suffer)解析：has suffered from

suffer与suffer from的区别  

suffer指一般的损害、痛苦等等，但suffer from指长期的或习惯性的痛苦或困难。

suffer 经受，使遭受（坏事，不愉快的事），其宾语一般是loss(损失), pain（疼痛）, punishment（惩罚）, defeat（失败）, wrong, hardship, torture, grief,  injustice, disappointment等。 

I will not suffer such conduct. 我不能容忍这种行为。 

They suffered huge losses in the financial crisis.  他们在经济危机时遭受了巨大损失。

He died very quickly, he didn't suffer much. 他死得很快,没有多少痛苦.

 You must be prepared to suffer consequences. 你要准备承担后果.

注：有时二者区别不大，可换用。

suffer hunger 挨饿；

 uffer from cold and hunger饥寒交迫